Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/519#discussion_r70529269
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/partition/PruneScanRule.java
---
@@ -143,6 +144,11 @@ public static final RelOptRule
getDirFilterOnScan(OptimizerRulesContext optimize
}
protected void doOnMatch(RelOptRuleCall call, Filter filterRel, Project
projectRel, TableScan scanRel) {
+ if (wasAllPartitionsPruned) {
--- End diff --
I feel this flag may lead to scenarios where pruning does not happen when
it should. The flag is PruneScanRule's internal variable. The same rule could
be applied to pruning for multiple tables. So, if PruneScanRule turns on this
flag for T1, then we might skip pruning logic for T2 later on, when this rule
is fired.
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