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Expressions containing some built-in functions may be badly optimized [CORE4460] #4780

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firebird-issue-importer opened this issue Jun 10, 2014 · 4 comments

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@firebird-issue-importer

Submitted by: @dyemanov

Test cases for predicates distributed into the union sub-parts:

select * from (
select rdb$relation_name from rdb$relations
union
select rdb$procedure_name from rdb$procedures
) as dt (name) where http://dt.name = ''

PLAN (DT RDB$RELATIONS INDEX (RDB$INDEX_0))
PLAN (DT RDB$PROCEDURES INDEX (RDB$INDEX_21))

select * from (
select rdb$relation_name from rdb$relations
union
select rdb$procedure_name from rdb$procedures
) as dt (name) where http://dt.name = upper('')

PLAN (DT RDB$RELATIONS INDEX (RDB$INDEX_0))
PLAN (DT RDB$PROCEDURES INDEX (RDB$INDEX_21))

select * from (
select rdb$relation_name from rdb$relations
union
select rdb$procedure_name from rdb$procedures
) as dt (name) where http://dt.name = trim('')

PLAN (DT RDB$RELATIONS INDEX (RDB$INDEX_0))
PLAN (DT RDB$PROCEDURES INDEX (RDB$INDEX_21))

select * from (
select rdb$relation_name from rdb$relations
union
select rdb$procedure_name from rdb$procedures
) as dt (name) where http://dt.name = left('', 0)

PLAN (DT RDB$RELATIONS NATURAL)
PLAN (DT RDB$PROCEDURES NATURAL)

select * from (
select rdb$relation_name from rdb$relations
union
select rdb$procedure_name from rdb$procedures
) as dt (name) where http://dt.name = minvalue('', '')

PLAN (DT RDB$RELATIONS NATURAL)
PLAN (DT RDB$PROCEDURES NATURAL)

select * from (
select rdb$relation_name from rdb$relations
union
select rdb$procedure_name from rdb$procedures
) as dt (name) where http://dt.name = rpad('', 0, '')

PLAN (DT RDB$RELATIONS NATURAL)
PLAN (DT RDB$PROCEDURES NATURAL)

The issue does not affect v3.0.

Commits: 480bd4c FirebirdSQL/fbt-repository@18ac373

@firebird-issue-importer
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firebird-issue-importer commented Jun 10, 2014

Modified by: @dyemanov

status: Open [ 1 ] => Resolved [ 5 ]

resolution: Fixed [ 1 ]

Fix Version: 2.5.3 [ 10461 ]

assignee: Dmitry Yemanov [ dimitr ]

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firebird-issue-importer commented May 29, 2015

Modified by: @pavel-zotov

status: Resolved [ 5 ] => Resolved [ 5 ]

QA Status: Done successfully

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firebird-issue-importer commented Jun 1, 2015

Modified by: @pavel-zotov

status: Resolved [ 5 ] => Resolved [ 5 ]

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firebird-issue-importer commented Jun 1, 2015

Modified by: @pavel-zotov

status: Resolved [ 5 ] => Closed [ 6 ]

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