mirror of
https://github.com/FirebirdSQL/firebird.git
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Added better support for using indices with "OR".
Pick the best available compound index from all "AND" nodes.
This commit is contained in:
arnobrinkman
parent
56589e2b3b
commit
1d84ffbfd3
@ -23,9 +23,6 @@
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* 2002.10.28 Sean Leyne - Code cleanup, removed obsolete "DecOSF" port
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*
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*/
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/*
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$Id: btr.h,v 1.3 2002-10-29 03:17:43 seanleyne Exp $
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*/
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#ifndef _JRD_BTR_H_
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#define _JRD_BTR_H_
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@ -104,6 +101,8 @@ typedef struct idx {
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#define idx_navigate 8 /* index was in fact selected for navigation */
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#define idx_plan_missing 16 /* index mentioned in missing clause */
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#define idx_plan_starts 32 /* index mentioned in starts clause */
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#define idx_used_with_and 64 /* marker used in procedure sort_indices */
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#define idx_marker 128 /* marker used in procedure sort_indices */
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/* Macro to locate the next IDX block */
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384
src/jrd/opt.cpp
384
src/jrd/opt.cpp
@ -27,13 +27,17 @@
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* returned to the free pool.
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* 2001.02.15: Claudio Valderrama: Don't obfuscate the plan output if a selectable
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* stored procedure doesn't access tables, views or other procedures directly.
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*
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* 2002.10.29 Sean Leyne - Removed obsolete "Netware" port
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* 2002.10.30: Arno Brinkman: Changes made to gen_retrieval, OPT_compile and make_inversion.
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* Procedure sort_indices added. The changes in gen_retrieval are that now
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* an index with high field-count has priority to build an index from.
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* Procedure make_inversion is changed so that it not pick every index
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* that comes away, this was slow performance with bad selectivity indices
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* which most are foreign_keys with a reference to a few records.
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* 2002.11.01: Arno Brinkman: Added match_indices for better support of OR handling
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* in INNER JOIN (gen_join) statements.
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*
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*/
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/*
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$Id: opt.cpp,v 1.19 2002-10-30 06:40:48 seanleyne Exp $
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*/
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#include "firebird.h"
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#include "../jrd/ib_stdio.h"
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@ -132,6 +136,7 @@ static NOD make_starts(TDBB, register OPT, REL, NOD, USHORT, IDX *);
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static BOOLEAN map_equal(NOD, NOD, NOD);
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static void mark_indices(csb_repeat *, SSHORT);
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static SSHORT match_index(TDBB, register OPT, SSHORT, register NOD, IDX *);
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static BOOLEAN match_indices(TDBB, register OPT, SSHORT, register NOD, IDX *);
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static USHORT nav_rsb_size(RSB, USHORT, USHORT);
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static BOOLEAN node_equality(NOD, NOD);
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static NOD optimize_like(TDBB, NOD);
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@ -145,6 +150,7 @@ static void set_inactive(OPT, RIV);
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static void set_made_river(OPT, RIV);
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static void set_position(NOD, NOD, NOD);
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static void set_rse_inactive(CSB, RSE);
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static void sort_indices(csb_repeat *);
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/* macro definitions */
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@ -491,7 +497,7 @@ RSB OPT_compile(TDBB tdbb,
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&csb->csb_rpt[stream].csb_idx,
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&csb->csb_rpt[stream].csb_idx_allocation,
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&idx_size);
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sort_indices(&csb->csb_rpt[stream]);
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mark_indices(&csb->csb_rpt[stream], relation->rel_id);
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}
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else
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@ -2878,7 +2884,8 @@ static void form_rivers(TDBB tdbb,
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count = find_order(tdbb, opt, temp, plan_node);
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while (form_river
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(tdbb, opt, count, streams, temp, river_stack, sort_clause,
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project_clause, 0));}
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project_clause, 0));
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}
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static BOOLEAN form_river(TDBB tdbb,
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@ -3647,16 +3654,18 @@ static RSB gen_retrieval(TDBB tdbb,
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*
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**************************************/
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register CSB csb;
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IRL relationship;
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REL relation;
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STR alias;
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RSB rsb;
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IDX *idx;
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NOD node, opt_boolean, inversion;
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USHORT segments;
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SSHORT i;
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register Opt::opt_repeat * tail, *opt_end, *idx_tail, *idx_end;
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SSHORT i, j, count;
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USHORT idx_field_count[MAX_INDICES];
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USHORT max_field_count = 0;
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register Opt::opt_repeat * tail, *opt_end, *idx_tail, *idx_end, *matching_nodes[MAX_INDICES];
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csb_repeat *csb_tail;
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BOOLEAN full = FALSE;
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BOOLEAN full = FALSE, accept_index, idx_begin_equal[MAX_INDICES];
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SET_TDBB(tdbb);
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#ifdef DEV_BUILD
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DEV_BLKCHK(opt, type_opt);
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@ -3702,20 +3711,22 @@ static RSB gen_retrieval(TDBB tdbb,
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to be made that it is a deoptimization and more testing needs to be done
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to determine that; see more comments in the bug description
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*/
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if (sort_ptr && *sort_ptr && project_ptr && *project_ptr)
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if (sort_ptr && *sort_ptr && project_ptr && *project_ptr) {
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sort_ptr = NULL;
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}
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/* Time to find inversions. For each index on the relation
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match all unused booleans against the index looking for upper
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and lower bounds that can be computed by the index. When
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all unused conjunctions are exhausted, see if there is enough
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information for an index retrieval. If so, build up an
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inversion component of the boolean. */
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inversion = NULL;
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opt_end =
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opt->opt_rpt +
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(inner_flag ? opt->opt_count : opt->opt_parent_count); rsb = NULL;
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if (relation->rel_file)
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opt_end = opt->opt_rpt + (inner_flag ? opt->opt_count : opt->opt_parent_count);
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rsb = NULL;
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if (relation->rel_file) {
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rsb = EXT_optimize(opt, stream, sort_ptr ? sort_ptr : project_ptr);
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}
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else if (opt->opt_parent_count || (sort_ptr && *sort_ptr)
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/***|| (project_ptr && *project_ptr)***/
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) {
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@ -3728,22 +3739,17 @@ static RSB gen_retrieval(TDBB tdbb,
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could be calculated via the index; currently we won't detect that case
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*/
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segments = 0;
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for (i = 0, idx = csb_tail->csb_idx; i < csb_tail->csb_indices;
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i++, idx = NEXT_IDX(idx->idx_rpt, idx->idx_count))
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segments = MAX(segments, idx->idx_count);
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for (; segments; segments--)
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for (i = 0, idx = csb_tail->csb_idx; i < csb_tail->csb_indices;
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i++, idx = NEXT_IDX(idx->idx_rpt, idx->idx_count)) {
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/* skip this index if it doesn't have the right number of segments */
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if (idx->idx_count != segments)
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continue;
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idx_field_count[i] = 0;
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idx_begin_equal[i] = FALSE;
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/* skip this part if the index wasn't specified for indexed
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retrieval (still need to look for navigational retrieval) */
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if ((idx->idx_runtime_flags & idx_plan_dont_use) &&
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!(idx->idx_runtime_flags & idx_plan_navigate))
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continue;
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/* go through all the unused conjuncts and see if
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any of them are computable using this index */
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clear_bounds(opt, idx);
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@ -3751,15 +3757,22 @@ static RSB gen_retrieval(TDBB tdbb,
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if (outer_flag)
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tail += opt->opt_count;
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for (; tail < opt_end; tail++) {
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CLEAR_DEP_BIT(tail->opt_can_use_idx, i);
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if (tail->opt_flags & opt_matched)
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continue;
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node = tail->opt_conjunct;
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if (!(tail->opt_flags & opt_used)
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&& computable(csb, node, -1,
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(BOOLEAN) (inner_flag
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|| outer_flag) ? TRUE :
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FALSE)) match_index(tdbb, opt, stream,
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node, idx);
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(BOOLEAN) (inner_flag || outer_flag) ? TRUE : FALSE)) {
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if (count = match_index(tdbb, opt, stream, node, idx)) {
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/* mark the index in the bitmap and if this conjunct
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has a own index mark this also */
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SET_DEP_BIT(tail->opt_can_use_idx, i);
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if (idx->idx_count == count) {
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tail->opt_idx_full_match = TRUE;
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}
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}
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}
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if (node->nod_type == nod_starts)
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compose(&inversion,
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make_starts(tdbb, opt, relation, node, stream,
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@ -3773,7 +3786,6 @@ static RSB gen_retrieval(TDBB tdbb,
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/* look for a navigational retrieval (unless one was already found or
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there is no sort block); if no navigational retrieval on this index,
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add an indexed retrieval to the inversion tree */
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if (!rsb) {
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if (sort_ptr && *sort_ptr) {
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if ( (rsb =
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@ -3797,24 +3809,75 @@ static RSB gen_retrieval(TDBB tdbb,
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}***/
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}
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/* Count the real number of fields that could be matched */
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if (opt->opt_rpt[0].opt_lower || opt->opt_rpt[0].opt_upper) {
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compose(&inversion,
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OPT_make_index(tdbb, opt, relation, idx),
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nod_bit_and); if (!outer_flag) {
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/* Mark conjuncts as matched if they actually participate in
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the indexed retrieval. A conjunct matches against an index
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segment only if all more major index segment positions have
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been matched by conjuncts. */
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idx_tail = opt->opt_rpt;
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idx_end = idx_tail + idx->idx_count;
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for (;
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idx_tail < idx_end && (idx_tail->opt_lower
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|| idx_tail->opt_upper);
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idx_tail++)
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for (tail = opt->opt_rpt; tail < opt_end; tail++)
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if (idx_tail->opt_match == tail->opt_conjunct)
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tail->opt_flags |= opt_matched;
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node = idx_tail->opt_match;
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if (node->nod_type == nod_eql) {
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idx_begin_equal[i] = TRUE;
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}
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for (;idx_tail < idx_end && (idx_tail->opt_lower ||
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idx_tail->opt_upper); idx_tail++) {
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idx_field_count[i]++;
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max_field_count = MAX(max_field_count, idx_field_count[i]);
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}
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}
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}
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/* Walk through the indicies based on earlier calculated count and
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when necessary build the index */
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for (; max_field_count; max_field_count--) {
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for (i = 0, idx = csb_tail->csb_idx; i < csb_tail->csb_indices; i++,
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idx = NEXT_IDX(idx->idx_rpt, idx->idx_count)) {
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if (idx->idx_runtime_flags & idx_plan_dont_use) {
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continue;
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}
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if (idx_field_count[i] == max_field_count) {
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j = 0;
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clear_bounds(opt, idx);
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for (tail = opt->opt_rpt; tail < opt_end; tail++) {
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/* Test if this conjunction is available for this index. */
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if (TEST_DEP_BIT(tail->opt_can_use_idx, i) &&
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!(tail->opt_flags & opt_matched)) {
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/* Setting opt_lower and/or opt_upper values */
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node = tail->opt_conjunct;
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match_index(tdbb, opt, stream, node, idx);
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matching_nodes[j++] = tail;
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count = j;
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}
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}
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if (opt->opt_rpt[0].opt_lower || opt->opt_rpt[0].opt_upper) {
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accept_index = TRUE;
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/* If all fields in this index can also use a own index
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and the first field isn't compared as equality
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than don't accept create this index */
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if (!idx_begin_equal[i]) {
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if (idx->idx_count > 1) {
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accept_index = FALSE;
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for (j = 0; j < count; j++) {
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if (!matching_nodes[j]->opt_idx_full_match) {
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accept_index = TRUE;
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}
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}
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}
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}
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if (accept_index) {
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/* Mark all nodes that could be matched in this index as
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used, so that no unnecessary duplicated indicies are build. */
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for (j = 0; j < count; j++) {
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if (idx_begin_equal[i] ||
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idx->idx_count == 1 ||
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!matching_nodes[j]->opt_idx_full_match) {
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matching_nodes[j]->opt_flags |= opt_matched;
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}
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}
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compose(&inversion, OPT_make_index(tdbb, opt, relation, idx),
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nod_bit_and);
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idx->idx_runtime_flags |= idx_used_with_and;
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}
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}
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}
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}
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}
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@ -3843,25 +3906,29 @@ static RSB gen_retrieval(TDBB tdbb,
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mark the stream to denote unmatched booleans. */
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opt_boolean = NULL;
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opt_end =
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opt->opt_rpt + (inner_flag ? opt->opt_count : opt->opt_parent_count);
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opt_end = opt->opt_rpt + (inner_flag ? opt->opt_count : opt->opt_parent_count);
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tail = opt->opt_rpt;
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if (outer_flag)
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if (outer_flag) {
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tail += opt->opt_count;
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}
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for (; tail < opt_end; tail++) {
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node = tail->opt_conjunct;
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if (!relation->rel_file)
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compose(&inversion, OPT_make_dbkey(opt, node, stream),
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nod_bit_and); if (!(tail->opt_flags & opt_used)
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if (!relation->rel_file) {
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compose(&inversion, OPT_make_dbkey(opt, node, stream), nod_bit_and);
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}
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if (!(tail->opt_flags & opt_used)
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&& computable(csb, node, -1, FALSE)) {
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if (node->nod_type == nod_or)
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if (node->nod_type == nod_or) {
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compose(&inversion, make_inversion(tdbb, opt, node, stream),
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nod_bit_and); compose(&opt_boolean, node, nod_and);
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nod_bit_and);
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}
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compose(&opt_boolean, node, nod_and);
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tail->opt_flags |= opt_used;
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if (!outer_flag && !(tail->opt_flags & opt_matched))
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if (!outer_flag && !(tail->opt_flags & opt_matched)) {
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csb_tail->csb_flags |= csb_unmatched;
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}
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}
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}
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if (full)
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return gen_rsb(tdbb, opt, rsb, inversion, stream, relation, alias,
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@ -4532,7 +4599,11 @@ static IRL indexed_relationship(TDBB tdbb, OPT opt, USHORT stream)
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node = tail->opt_conjunct;
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if (!(tail->opt_flags & opt_used)
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&& computable(csb, node, -1, FALSE))
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match_index(tdbb, opt, stream, node, idx);
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/* AB: Why only check for and-structures ?
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Added match_indices for support of "OR" with INNER JOINs */
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/* match_index(tdbb, opt, stream, node, idx); */
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match_indices(tdbb, opt, stream, node, idx);
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}
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tail = opt->opt_rpt;
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@ -4811,9 +4882,12 @@ static NOD make_inversion(TDBB tdbb,
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**************************************/
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REL relation;
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IDX *idx;
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NOD inversion, inversion2;
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NOD inversion, inversion2, node;
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SSHORT i;
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csb_repeat *csb_tail;
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float selectivity;
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BOOLEAN accept, used_in_compound;
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SET_TDBB(tdbb);
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DEV_BLKCHK(opt, type_opt);
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DEV_BLKCHK(boolean, type_nod);
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@ -4823,16 +4897,17 @@ static NOD make_inversion(TDBB tdbb,
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return NULL;
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/* Handle the "OR" case up front */
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if (boolean->nod_type == nod_or) {
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if (!
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(inversion =
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make_inversion(tdbb, opt, boolean->nod_arg[0],
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stream))) return NULL;
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if ( (inversion2 =
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make_inversion(tdbb, opt, boolean->nod_arg[1],
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stream)) ) return compose(&inversion, inversion2,
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nod_bit_or);
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if (inversion->nod_type == nod_index)
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if (! (inversion = make_inversion(tdbb, opt, boolean->nod_arg[0],
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stream))) {
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return NULL;
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}
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if ( (inversion2 = make_inversion(tdbb, opt, boolean->nod_arg[1],
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stream)) ) {
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return compose(&inversion, inversion2, nod_bit_or);
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}
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if (inversion->nod_type == nod_index) {
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delete inversion->nod_arg[e_idx_retrieval];
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}
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delete inversion;
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return NULL;
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}
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@ -4844,28 +4919,83 @@ static NOD make_inversion(TDBB tdbb,
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information for an index retrieval. If so, build up and
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inversion component of the boolean. */
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/* AB: If the boolean is a part of an earlier created index
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retrieval don't think about to use a own index. */
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accept = TRUE;
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used_in_compound = FALSE;
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selectivity = 1; /* Real maximum selectivity possible is 1 */
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idx = csb_tail->csb_idx;
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if (opt->opt_count) {
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for (i = 0; i < csb_tail->csb_indices; i++) {
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if (idx->idx_runtime_flags & idx_used_with_and) {
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clear_bounds(opt, idx);
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if ((match_index(tdbb, opt, stream, boolean, idx)) &&
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(idx->idx_selectivity < selectivity)) {
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selectivity = idx->idx_selectivity;
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used_in_compound = TRUE;
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}
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}
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idx = NEXT_IDX(idx->idx_rpt, idx->idx_count);
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}
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}
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idx = csb_tail->csb_idx;
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inversion = NULL;
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if (opt->opt_count)
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if (opt->opt_count) {
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for (i = 0; i < csb_tail->csb_indices; i++) {
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/* AB: If we are not using a PLAN or could make an index don't
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walk further through the indices */
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if (!accept && !csb_tail->csb_plan) {
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break;
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}
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clear_bounds(opt, idx);
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/* skip this part if the index wasn't specified for indexed
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retrieval (still need to look for navigational retrieval) */
|
||||
if (idx->idx_runtime_flags & idx_plan_dont_use)
|
||||
if (idx->idx_runtime_flags & idx_plan_dont_use) {
|
||||
continue;
|
||||
}
|
||||
|
||||
/* AB: We accept only 1 index for a boolean. This must be enough
|
||||
because the indices are sort based on selectivity.
|
||||
We based our factor 2000 on little experience, when our boolean
|
||||
is used in a compound index (that is an AND boolean). It's only
|
||||
interesting to use it if it's better as the compound index
|
||||
selectivity * factor */
|
||||
if (((accept || used_in_compound) &&
|
||||
(idx->idx_selectivity < selectivity * 2000)) ||
|
||||
(csb_tail->csb_plan)) {
|
||||
match_index(tdbb, opt, stream, boolean, idx);
|
||||
if (opt->opt_rpt[0].opt_lower || opt->opt_rpt[0].opt_upper)
|
||||
if (opt->opt_rpt[0].opt_lower || opt->opt_rpt[0].opt_upper) {
|
||||
compose(&inversion, OPT_make_index(tdbb, opt, relation, idx),
|
||||
nod_bit_and); if (boolean->nod_type == nod_starts)
|
||||
nod_bit_and);
|
||||
accept = FALSE;
|
||||
}
|
||||
}
|
||||
|
||||
if (boolean->nod_type == nod_starts) {
|
||||
compose(&inversion,
|
||||
make_starts(tdbb, opt, relation, boolean, stream,
|
||||
idx), nod_bit_and);
|
||||
if (boolean->nod_type == nod_missing)
|
||||
node = make_starts(tdbb, opt, relation, boolean, stream, idx),
|
||||
nod_bit_and);
|
||||
if (node) {
|
||||
accept = FALSE;
|
||||
}
|
||||
}
|
||||
|
||||
if (boolean->nod_type == nod_missing) {
|
||||
compose(&inversion,
|
||||
make_missing(tdbb, opt, relation, boolean, stream,
|
||||
idx), nod_bit_and);
|
||||
node = make_missing(tdbb, opt, relation, boolean, stream, idx),
|
||||
nod_bit_and);
|
||||
if (node) {
|
||||
accept = FALSE;
|
||||
}
|
||||
}
|
||||
|
||||
idx = NEXT_IDX(idx->idx_rpt, idx->idx_count);
|
||||
}
|
||||
}
|
||||
|
||||
if (!inversion)
|
||||
inversion = OPT_make_dbkey(opt, boolean, stream);
|
||||
@ -5199,6 +5329,52 @@ static SSHORT match_index(TDBB tdbb,
|
||||
}
|
||||
|
||||
|
||||
static BOOLEAN match_indices(TDBB tdbb,
|
||||
register OPT opt,
|
||||
SSHORT stream, register NOD boolean, IDX * idx)
|
||||
{
|
||||
/**************************************
|
||||
*
|
||||
* m a t c h _ i n d i c e s
|
||||
*
|
||||
**************************************
|
||||
*
|
||||
* Functional description
|
||||
* Match a boolean against an index location lower and upper
|
||||
* bounds. Return the number of relational nodes that were
|
||||
* matched. In ODS versions prior to 7, descending indexes
|
||||
* were not reliable and will not be used.
|
||||
*
|
||||
**************************************/
|
||||
DEV_BLKCHK(opt, type_opt);
|
||||
DEV_BLKCHK(boolean, type_nod);
|
||||
SET_TDBB(tdbb);
|
||||
|
||||
if (boolean->nod_count < 2) {
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
if (boolean->nod_type == nod_or) {
|
||||
if (match_indices(tdbb, opt, stream, boolean->nod_arg[0], idx) &&
|
||||
match_indices(tdbb, opt, stream, boolean->nod_arg[1], idx)) {
|
||||
opt->opt_rpt->opt_match = NULL;
|
||||
return TRUE;
|
||||
}
|
||||
}
|
||||
else {
|
||||
if (match_index(tdbb, opt, stream, boolean, idx)) {
|
||||
opt->opt_rpt->opt_match = NULL;
|
||||
return TRUE;
|
||||
}
|
||||
}
|
||||
opt->opt_rpt->opt_match = NULL;
|
||||
opt->opt_rpt->opt_upper = NULL;
|
||||
opt->opt_rpt->opt_lower = NULL;
|
||||
return FALSE;
|
||||
|
||||
}
|
||||
|
||||
|
||||
static USHORT nav_rsb_size(RSB rsb, USHORT key_length, USHORT size)
|
||||
{
|
||||
/**************************************
|
||||
@ -5676,3 +5852,67 @@ static void set_rse_inactive(CSB csb, RSE rse)
|
||||
set_rse_inactive(csb, (RSE) node);
|
||||
}
|
||||
}
|
||||
|
||||
static void sort_indices(csb_repeat * csb_tail)
|
||||
{
|
||||
/***************************************************
|
||||
*
|
||||
* s o r t _ i n d i c e s
|
||||
*
|
||||
***************************************************
|
||||
*
|
||||
* Functional Description:
|
||||
* Sort indices based on there selectivity.
|
||||
* Lowest selectivy as first, higest as last.
|
||||
*
|
||||
***************************************************/
|
||||
IDX *idx, *selected_idx;
|
||||
USHORT i, j;
|
||||
IDX idx_sort[MAX_IDX];
|
||||
float selectivity;
|
||||
|
||||
if (csb_tail->csb_plan) {
|
||||
return;
|
||||
}
|
||||
|
||||
/* Walk through the indices and sort them into into idx_sort
|
||||
where idx_sort[0] contains the lowest selectivity and
|
||||
idx_sort[csb_tail->csb_indices - 1] the highest */
|
||||
|
||||
if (csb_tail->csb_idx && (csb_tail->csb_indices > 1)) {
|
||||
for (j = 0; j < csb_tail->csb_indices; j++) {
|
||||
selectivity = 1000; /* Maximum selectivity is 1 (when all keys are the same) */
|
||||
idx = csb_tail->csb_idx;
|
||||
for (i = 0; i < csb_tail->csb_indices; i++) {
|
||||
if (!(idx->idx_runtime_flags & idx_marker) &&
|
||||
(idx->idx_selectivity <= selectivity)) {
|
||||
selectivity = idx->idx_selectivity;
|
||||
selected_idx = idx;
|
||||
}
|
||||
idx = NEXT_IDX(idx->idx_rpt, idx->idx_count);
|
||||
}
|
||||
if (!selected_idx) {
|
||||
idx = csb_tail->csb_idx;
|
||||
for (i = 0; i < csb_tail->csb_indices; i++) {
|
||||
if (!(idx->idx_runtime_flags & idx_marker)) {
|
||||
selected_idx = idx;
|
||||
break;
|
||||
}
|
||||
idx = NEXT_IDX(idx->idx_rpt, idx->idx_count);
|
||||
}
|
||||
}
|
||||
selected_idx->idx_runtime_flags |= idx_marker;
|
||||
MOVE_FAST(selected_idx, &idx_sort[j], sizeof(IDX));
|
||||
}
|
||||
|
||||
/* Finally store the right order in cbs_tail->csb_idx */
|
||||
idx = csb_tail->csb_idx;
|
||||
for (j = 0; j < csb_tail->csb_indices; j++) {
|
||||
idx->idx_runtime_flags &= ~idx_marker;
|
||||
MOVE_FAST(&idx_sort[j], idx, sizeof(IDX));
|
||||
idx = NEXT_IDX(idx->idx_rpt, idx->idx_count);
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user