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Commited5d55d

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committed
Fix a bug in the original implementation of redundant-join-clause removal:
clauses in which one side or the other references both sides of the joincannot be removed as redundant, because that expression won't have beenconstrained below the join. Per report from Sergey Burladyan.CVS HEAD does not contain this bug due to EquivalenceClass rewrite, but itseems wise to include the regression test for it anyway.
1 parentbc421c3 commited5d55d

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3 files changed

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3 files changed

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‎src/test/regress/expected/join.out

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@@ -2250,3 +2250,19 @@ WHERE d.f1 IS NULL;
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9999
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(3 rows)
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--
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-- regression test for problems of the sort depicted in bug #3494
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--
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create temp table tt5(f1 int, f2 int);
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create temp table tt6(f1 int, f2 int);
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insert into tt5 values(1, 10);
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insert into tt5 values(1, 11);
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insert into tt6 values(1, 9);
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insert into tt6 values(1, 2);
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insert into tt6 values(2, 9);
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select * from tt5,tt6 where tt5.f1 = tt6.f1 and tt5.f1 = tt5.f2 - tt6.f2;
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f1 | f2 | f1 | f2
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----+----+----+----
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1 | 10 | 1 | 9
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(1 row)
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‎src/test/regress/expected/join_1.out

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@@ -2250,3 +2250,19 @@ WHERE d.f1 IS NULL;
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9999
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(3 rows)
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--
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-- regression test for problems of the sort depicted in bug #3494
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--
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create temp table tt5(f1 int, f2 int);
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create temp table tt6(f1 int, f2 int);
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insert into tt5 values(1, 10);
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insert into tt5 values(1, 11);
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insert into tt6 values(1, 9);
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insert into tt6 values(1, 2);
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insert into tt6 values(2, 9);
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select * from tt5,tt6 where tt5.f1 = tt6.f1 and tt5.f1 = tt5.f2 - tt6.f2;
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f1 | f2 | f1 | f2
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----+----+----+----
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1 | 10 | 1 | 9
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(1 row)
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‎src/test/regress/sql/join.sql

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Original file line numberDiff line numberDiff line change
@@ -424,3 +424,19 @@ LEFT JOIN (
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WHEREc.f1 ISNULL
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)AS dON (a.f1=d.f1)
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WHEREd.f1 ISNULL;
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--
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-- regression test for problems of the sort depicted in bug #3494
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--
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create temp table tt5(f1int, f2int);
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create temp table tt6(f1int, f2int);
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insert into tt5values(1,10);
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insert into tt5values(1,11);
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insert into tt6values(1,9);
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insert into tt6values(1,2);
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insert into tt6values(2,9);
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select*from tt5,tt6wherett5.f1=tt6.f1andtt5.f1=tt5.f2-tt6.f2;

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