[SPARK-31958][SQL] normalize special floating numbers in subquery #28785
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maropu
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Jun 10, 2020
| def apply(plan: LogicalPlan): LogicalPlan = plan match { | ||
| // A subquery will be rewritten into join later, and will go through this rule | ||
| // eventually. Here we skip subquery, as we only need to run this rule once. | ||
| case _: Subquery => plan |
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How about adding tests for the subquery case in NormalizeFloatingPointNumbersSuite, too?
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No we can't.
This fix relies on the rule OptimizeSubqueries, which is an inner object of the class Optimizer as it needs to rerun the entire optimizer for subquery. So we can't use OptimizeSubqueries in NormalizeFloatingPointNumbersSuite.
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Test build #123771 has finished for PR 28785 at commit
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viirya
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Jun 11, 2020
viirya
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Jun 11, 2020
| * Note that, this rule must be executed at the end of optimizer, because the optimizer may create | ||
| * new joins(the subquery rewrite) and new join conditions(the join reorder). | ||
| */ | ||
| object NormalizeFloatingNumbers extends Rule[LogicalPlan] { |
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Does it also mean This batch must be executed after the RewriteSubquery batch, which creates joins. is not definitely true now?
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it's still true, the correlated subquery becomes join, and may have new join keys.
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thanks for the review, merging to master/3.0! |
cloud-fan
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Jun 11, 2020
### What changes were proposed in this pull request? This is a followup of #23388 . #23388 has an issue: it doesn't handle subquery expressions and assumes they will be turned into joins. However, this is not true for non-correlated subquery expressions. This PR fixes this issue. It now doesn't skip `Subquery`, and subquery expressions will be handled by `OptimizeSubqueries`, which runs the optimizer with the subquery. Note that, correlated subquery expressions will be handled twice: once in `OptimizeSubqueries`, once later when it becomes join. This is OK as `NormalizeFloatingNumbers` is idempotent now. ### Why are the changes needed? fix a bug ### Does this PR introduce _any_ user-facing change? yes, see the newly added test. ### How was this patch tested? new test Closes #28785 from cloud-fan/normalize. Authored-by: Wenchen Fan <[email protected]> Signed-off-by: Wenchen Fan <[email protected]> (cherry picked from commit 6fb9c80) Signed-off-by: Wenchen Fan <[email protected]>
holdenk
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Jun 25, 2020
### What changes were proposed in this pull request? This is a followup of apache#23388 . apache#23388 has an issue: it doesn't handle subquery expressions and assumes they will be turned into joins. However, this is not true for non-correlated subquery expressions. This PR fixes this issue. It now doesn't skip `Subquery`, and subquery expressions will be handled by `OptimizeSubqueries`, which runs the optimizer with the subquery. Note that, correlated subquery expressions will be handled twice: once in `OptimizeSubqueries`, once later when it becomes join. This is OK as `NormalizeFloatingNumbers` is idempotent now. ### Why are the changes needed? fix a bug ### Does this PR introduce _any_ user-facing change? yes, see the newly added test. ### How was this patch tested? new test Closes apache#28785 from cloud-fan/normalize. Authored-by: Wenchen Fan <[email protected]> Signed-off-by: Wenchen Fan <[email protected]> (cherry picked from commit 6fb9c80) Signed-off-by: Wenchen Fan <[email protected]>
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What changes were proposed in this pull request?
This is a followup of #23388 .
#23388 has an issue: it doesn't handle subquery expressions and assumes they will be turned into joins. However, this is not true for non-correlated subquery expressions.
This PR fixes this issue. It now doesn't skip
Subquery, and subquery expressions will be handled byOptimizeSubqueries, which runs the optimizer with the subquery.Note that, correlated subquery expressions will be handled twice: once in
OptimizeSubqueries, once later when it becomes join. This is OK asNormalizeFloatingNumbersis idempotent now.Why are the changes needed?
fix a bug
Does this PR introduce any user-facing change?
yes, see the newly added test.
How was this patch tested?
new test