Wenchen Fan 7d045c5f00 [SPARK-22944][SQL] improve FoldablePropagation ... ## What changes were proposed in this pull request? `FoldablePropagation` is a little tricky as it needs to handle attributes that are miss-derived from children, e.g. outer join outputs. This rule does a kind of stop-able tree transform, to skip to apply this rule when hit a node which may have miss-derived attributes. Logically we should be able to apply this rule above the unsupported nodes, by just treating the unsupported nodes as leaf nodes. This PR improves this rule to not stop the tree transformation, but reduce the foldable expressions that we want to propagate. ## How was this patch tested? existing tests Author: Wenchen Fan <wenchen@databricks.com> Closes #20139 from cloud-fan/foldable.		2018-01-04 13:14:52 +08:00
..
src	[SPARK-22944][SQL] improve FoldablePropagation	2018-01-04 13:14:52 +08:00
pom.xml	[SPARK-22607][BUILD] Set large stack size consistently for tests to avoid StackOverflowError	2017-11-26 07:42:44 -06:00