Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/844#discussion_r118802952
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/PlannerPhase.java ---
@@ -180,9 +180,19 @@ public RuleSet getRules(OptimizerRulesContext context,
Collection<StoragePlugin>
PHYSICAL("Physical Planning") {
public RuleSet getRules(OptimizerRulesContext context,
Collection<StoragePlugin> plugins) {
+ final RuleSet storageRules = getStorageRules(context, plugins, this);
+
+ final Builder<RelOptRule> newStorageRulesBuilder =
ImmutableSet.builder();
+ for (final RelOptRule relOptRule : storageRules) {
+ // exclude ProjectRemoveRule to prevent Drill from losing column
alias or displaying implicit columns
+ if (!(relOptRule instanceof ProjectRemoveRule)) {
--- End diff --
For query "select version as current_version from t;", why will
ProjectRemoveRule think that the Project operator is a trivial project? I
assume that the input/output's field name is different.
If there is bug in ProjectRemoveRule, it's better to fix that, in stead of
removing it completely.
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