mirror of
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107 lines
3.9 KiB
Python
107 lines
3.9 KiB
Python
#coding:utf-8
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"""
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ID: issue-3218
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ISSUE: 3218
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TITLE: Optimizer fails applying stream-local predicates before merging [CORE2832]
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DESCRIPTION:
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We evaluate number of records in rdb$relation_fields for which corresponding rows in rdb$relations have ID < 10.
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This value ('cnt_chk') must be equal to the number of indexed reads for this table when we run test query ('chk_sql').
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Before fix number of indexed reads in rdb$relation_fields was equal to the TOTAL number of rows in this table.
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FBTEST: bugs.gh_3218
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NOTES:
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[20.01.2024] pzotov
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Confirmed problem on 5.0.0.442: number of indexed reads was equal to the total count of records in rdb$relation_fields.
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Checked on 6.0.0.218, 5.0.1.1318.
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"""
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import pytest
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from pathlib import Path
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from firebird.qa import *
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init_sql = """
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set term ^;
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create or alter procedure sp_get_relations returns(
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rdb$relation_id type of column rdb$relations.rdb$relation_id,
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rdb$relation_name type of column rdb$relations.rdb$relation_name
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) as
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begin
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for
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select
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rdb$relation_id,
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rdb$relation_name
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from rdb$relations
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into
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rdb$relation_id,
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rdb$relation_name
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do
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begin
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suspend;
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end
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end
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^
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set term ;^
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commit;
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"""
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db = db_factory(init = init_sql)
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act = python_act('db')
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#----------------------------------------------------------
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def replace_leading(source, char="#"):
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stripped = source.lstrip()
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return char * (len(source) - len(stripped)) + stripped
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#----------------------------------------------------------
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@pytest.mark.version('>=5.0')
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def test_1(act: Action, capsys):
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with act.db.connect() as con:
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cur = con.cursor()
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cur.execute("select rdb$relation_id from rdb$relations where rdb$relation_name = upper('rdb$relation_fields')")
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rf_rel_id = None
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for r in cur:
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rf_rel_id = r[0]
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assert rf_rel_id
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cur.execute("select count(iif(r.rdb$relation_id < 10, 1, null)) cnt_chk, count(*) as cnt_all from rdb$relation_fields rf left join rdb$relations r on rf.rdb$relation_name = r.rdb$relation_name and r.rdb$relation_id < 10")
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cnt_chk, cnt_all = cur.fetchall()[0][:2]
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#------------------------------------------------------
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result_map = {}
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chk_sql = 'select 1 from sp_get_relations r join rdb$relation_fields f on f.rdb$relation_name = r.rdb$relation_name where r.rdb$relation_id < 10'
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with cur.prepare(chk_sql) as ps:
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cur.execute(chk_sql)
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tabstat1 = [ p for p in con.info.get_table_access_stats() if p.table_id == rf_rel_id ]
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cur.fetchall()
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tabstat2 = [ p for p in con.info.get_table_access_stats() if p.table_id == rf_rel_id ]
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print( '\n'.join([replace_leading(s) for s in ps.detailed_plan.split('\n')]) ) # explained plan, with preserving indents by replacing leading spaces with '#'
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idx_reads = (tabstat2[0].indexed if tabstat2[0].indexed else 0)
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if tabstat1:
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idx_reads -= (tabstat1[0].indexed if tabstat1[0].indexed else 0)
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print('Result:')
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if idx_reads == 0 or idx_reads > cnt_chk:
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print(f'POOR! Number of records in rdb$relation_fields: 1) to be filtered: {cnt_chk}, 2) total: {cnt_all}. Number of indexed_reads: {idx_reads}')
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else:
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print('Acceptable.')
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act.expected_stdout = """
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Select Expression
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####-> Nested Loop Join (inner)
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########-> Filter
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############-> Procedure "SP_GET_RELATIONS" as "R" Scan
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########-> Filter
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############-> Table "RDB$RELATION_FIELDS" as "F" Access By ID
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################-> Bitmap
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####################-> Index "RDB$INDEX_4" Range Scan (full match)
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Result:
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Acceptable.
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"""
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act.stdout = capsys.readouterr().out
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assert act.clean_stdout == act.clean_expected_stdout
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