Github user arina-ielchiieva commented on a diff in the pull request:
https://github.com/apache/drill/pull/844#discussion_r118923600
--- 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 --
Actually, you are right there is a bug in ProjectRemoveRule in Calcite [1].
Jira was open at the beginning of this year: ProjectRemoveRule loses field
names [1].
[1] https://issues.apache.org/jira/browse/CALCITE-1584
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