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[no-release-notes] test for left join bug #2840

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merged 3 commits into from
Feb 4, 2025
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max-hoffman
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@zachmu zachmu left a comment

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LGTM, see comments

},
tests: []JoinOpTests{
{
Query: "select /*+ JOIN_ORDER(ab,xy) */ x from xy left join ab on x = a and z = 5 where a is null order by x ",
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Kind of surprised this join hint does anything, isn't it ignored? Maybe add a comment

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@max-hoffman max-hoffman Feb 4, 2025

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for these tests join order does not appear to be respected, the hint and join code has a lot of change, i imagine it worked at some point, we should probably fix that

"insert into ab values (0,1,0), (1,2,1), (2,3,2), (3,4,3);",
},
},
tests: []JoinOpTests{
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Because of the z=5 join condition, you're getting every row in the left table in the result set. You should have a variant where not every row in the left corner is included (because there is a match for at least one of the rows in the right-hand side of the join).

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added more tests

},
},
{
name: "type conversion panic bug",
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Should add a comment with details on what the error is here (comparing varchar to int literal)

@max-hoffman max-hoffman merged commit d8430eb into main Feb 4, 2025
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@max-hoffman max-hoffman deleted the max/left-join-null-bug branch February 4, 2025 22:08
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2 participants