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Posted to reviews@spark.apache.org by "kelvinjian-db (via GitHub)" <gi...@apache.org> on 2023/10/18 04:27:15 UTC
[PR] [SPARK-45586][SQL] Reduce compiler latency for plans with large expression trees [spark]
kelvinjian-db opened a new pull request, #43420:
URL: https://github.com/apache/spark/pull/43420
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### What changes were proposed in this pull request?
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* Included rule ID pruning when traversing the expression trees in `TypeCoercionRule` (this avoids us from traversing the expression tree over and over again in future iterations of the rule)
* Improved `EquivalentExpressions`:
* Since `supportedExpression()` is checking for the existence of a pattern in the tree, changed to check the `TreePatternBits` instead of recursing using `.exists()`
* When creating an `ExpressionEquals` object, calculating the height requires recursing through all of its children, which is O(n^2) when called upon each expression in the expression tree. This changes it so that this height is cached in the `TreeNode`, so that it is now O(n) when called upon each expression in the tree
* More targeted TreePatternBits pruning in `ResolveTimeZone` and `ConstantPropagation`
### Why are the changes needed?
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This PR improves some analyzer and optimizer rules to address inefficiencies when handling extremely large expression trees.
### Does this PR introduce _any_ user-facing change?
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No.
### How was this patch tested?
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There should be no plan changes, so no unit tests were modified.
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No.
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Re: [PR] [SPARK-45586][SQL] Reduce compiler latency for plans with large expression trees [spark]
Posted by "cloud-fan (via GitHub)" <gi...@apache.org>.
cloud-fan commented on code in PR #43420:
URL: https://github.com/apache/spark/pull/43420#discussion_r1363348250
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/EquivalentExpressions.scala:
##########
@@ -244,13 +239,9 @@ class EquivalentExpressions(
* Wrapper around an Expression that provides semantic equality.
*/
case class ExpressionEquals(e: Expression) {
- private def getHeight(tree: Expression): Int = {
- tree.children.map(getHeight).reduceOption(_ max _).getOrElse(0) + 1
- }
-
// This is used to do a fast pre-check for child-parent relationship. For example, expr1 can
// only be a parent of expr2 if expr1.height is larger than expr2.height.
- lazy val height = getHeight(e)
+ lazy val height: Int = e.height
Review Comment:
```suggestion
def height: Int = e.height
```
should this be a simple def now as the `e.height` is already a lazy val
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Re: [PR] [SPARK-45586][SQL] Reduce compiler latency for plans with large expression trees [spark]
Posted by "kelvinjian-db (via GitHub)" <gi...@apache.org>.
kelvinjian-db commented on code in PR #43420:
URL: https://github.com/apache/spark/pull/43420#discussion_r1364489772
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/EquivalentExpressions.scala:
##########
@@ -244,13 +239,9 @@ class EquivalentExpressions(
* Wrapper around an Expression that provides semantic equality.
*/
case class ExpressionEquals(e: Expression) {
- private def getHeight(tree: Expression): Int = {
- tree.children.map(getHeight).reduceOption(_ max _).getOrElse(0) + 1
- }
-
// This is used to do a fast pre-check for child-parent relationship. For example, expr1 can
// only be a parent of expr2 if expr1.height is larger than expr2.height.
- lazy val height = getHeight(e)
+ lazy val height: Int = e.height
Review Comment:
done!
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Re: [PR] [SPARK-45586][SQL] Reduce compiler latency for plans with large expression trees [spark]
Posted by "kelvinjian-db (via GitHub)" <gi...@apache.org>.
kelvinjian-db commented on code in PR #43420:
URL: https://github.com/apache/spark/pull/43420#discussion_r1363258110
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/EquivalentExpressions.scala:
##########
@@ -244,13 +239,9 @@ class EquivalentExpressions(
* Wrapper around an Expression that provides semantic equality.
*/
case class ExpressionEquals(e: Expression) {
- private def getHeight(tree: Expression): Int = {
- tree.children.map(getHeight).reduceOption(_ max _).getOrElse(0) + 1
- }
-
// This is used to do a fast pre-check for child-parent relationship. For example, expr1 can
// only be a parent of expr2 if expr1.height is larger than expr2.height.
- lazy val height = getHeight(e)
+ lazy val height = e.height
Review Comment:
done!
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Re: [PR] [SPARK-45586][SQL] Reduce compiler latency for plans with large expression trees [spark]
Posted by "cloud-fan (via GitHub)" <gi...@apache.org>.
cloud-fan commented on PR #43420:
URL: https://github.com/apache/spark/pull/43420#issuecomment-1769787870
The failed pyspark tests are unrelated, I'm merging it to master, thanks!
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Re: [PR] [SPARK-45586][SQL] Reduce compiler latency for plans with large expression trees [spark]
Posted by "cloud-fan (via GitHub)" <gi...@apache.org>.
cloud-fan closed pull request #43420: [SPARK-45586][SQL] Reduce compiler latency for plans with large expression trees
URL: https://github.com/apache/spark/pull/43420
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Re: [PR] [SPARK-45586][SQL] Reduce compiler latency for plans with large expression trees [spark]
Posted by "LuciferYang (via GitHub)" <gi...@apache.org>.
LuciferYang commented on code in PR #43420:
URL: https://github.com/apache/spark/pull/43420#discussion_r1363195122
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/EquivalentExpressions.scala:
##########
@@ -244,13 +239,9 @@ class EquivalentExpressions(
* Wrapper around an Expression that provides semantic equality.
*/
case class ExpressionEquals(e: Expression) {
- private def getHeight(tree: Expression): Int = {
- tree.children.map(getHeight).reduceOption(_ max _).getOrElse(0) + 1
- }
-
// This is used to do a fast pre-check for child-parent relationship. For example, expr1 can
// only be a parent of expr2 if expr1.height is larger than expr2.height.
- lazy val height = getHeight(e)
+ lazy val height = e.height
Review Comment:
nit:If possible, please change it to `lazy val height: Int = e.height`, public members should have type declarations.
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