Github user amansinha100 commented on a diff in the pull request:
https://github.com/apache/drill/pull/519#discussion_r71059510
--- 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 --
Pls see commit #ce509af for the changes. Since the 'all partitions pruned'
is a special case, I had to keep track of this state and propagate it during
the new FileSelection creation after partition pruning. Thus, if the first
phase directory pruning eliminated all partitions and we re-added 1 for schema
purposes, this directory selection will be eventually seen by the
ParquetGroupScan which will examine a flag 'wasAllPartitionsPruned' and decide
to retrieve only 1 file from this directory.
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