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Code Issues

Backport fix for CORE-3902 - Derived fields may not be optimized via an index.

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asfernandes 2012-08-21 00:53:06 +00:00
parent 74e8696858
commit 7e2aec6715
1 changed files with 32 additions and 23 deletions
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55
src/dsql/gen.cpp
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@ -172,37 +172,46 @@ void GEN_expr(CompiledStatement* statement, dsql_nod* node)
return;
case nod_derived_field:
// ASF: If we are not referencing a field, we should evaluate the expression based on
// a set (ORed) of contexts. If any of them are in a valid position the expression is
// evaluated, otherwise a NULL will be returned. This is fix for CORE-1246.
if (node->nod_arg[e_derived_field_value]->nod_type != nod_derived_field &&
node->nod_arg[e_derived_field_value]->nod_type != nod_field &&
node->nod_arg[e_derived_field_value]->nod_type != nod_dbkey &&
node->nod_arg[e_derived_field_value]->nod_type != nod_map)
{
const dsql_ctx* ctx = (dsql_ctx*) node->nod_arg[e_derived_field_context];
// ASF: If we are not referencing a field, we should evaluate the expression based on
// a set (ORed) of contexts. If any of them are in a valid position the expression is
// evaluated, otherwise a NULL will be returned. This is fix for CORE-1246.
// Note that the field may be enclosed by an alias.
if (ctx->ctx_main_derived_contexts.hasData())
dsql_nod* val = node;
while (val->nod_type == nod_alias)
val = val->nod_arg[e_alias_value];
if (val->nod_type != nod_derived_field &&
val->nod_type != nod_field &&
val->nod_type != nod_dbkey &&
val->nod_type != nod_map)
{
if (ctx->ctx_main_derived_contexts.getCount() > MAX_UCHAR)
{
ERRD_post(Arg::Gds(isc_sqlerr) << Arg::Num(-204) <<
Arg::Gds(isc_imp_exc) <<
Arg::Gds(isc_ctx_too_big));
}
const dsql_ctx* ctx = (dsql_ctx*) node->nod_arg[e_derived_field_context];
stuff(statement, blr_derived_expr);
stuff(statement, ctx->ctx_main_derived_contexts.getCount());
for (DsqlContextStack::const_iterator stack(ctx->ctx_main_derived_contexts);
stack.hasData(); ++stack)
if (ctx->ctx_main_derived_contexts.hasData())
{
fb_assert(stack.object()->ctx_context <= MAX_UCHAR);
stuff(statement, stack.object()->ctx_context);
if (ctx->ctx_main_derived_contexts.getCount() > MAX_UCHAR)
{
ERRD_post(Arg::Gds(isc_sqlerr) << Arg::Num(-204) <<
Arg::Gds(isc_imp_exc) <<
Arg::Gds(isc_ctx_too_big));
}
stuff(statement, blr_derived_expr);
stuff(statement, ctx->ctx_main_derived_contexts.getCount());
for (DsqlContextStack::const_iterator stack(ctx->ctx_main_derived_contexts);
stack.hasData(); ++stack)
{
fb_assert(stack.object()->ctx_context <= MAX_UCHAR);
stuff(statement, stack.object()->ctx_context);
}
}
}
GEN_expr(statement, node->nod_arg[e_derived_field_value]);
}
GEN_expr(statement, node->nod_arg[e_derived_field_value]);
return;
case nod_extract: