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https://issues.apache.org/jira/browse/DRILL-6606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16548709#comment-16548709
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ASF GitHub Bot commented on DRILL-6606:
---------------------------------------
Ben-Zvi commented on a change in pull request #1384: DRILL-6606: Fixed bug in
HashJoin that caused it not to return OK_NEW_SCHEMA in some cases.
URL: https://github.com/apache/drill/pull/1384#discussion_r203576783
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/join/HashJoinBatch.java
##########
@@ -317,7 +422,25 @@ public HashJoinMemoryCalculator getCalculatorImpl() {
@Override
public IterOutcome innerNext() {
- // In case incoming was killed before, just cleanup and return
+ if (!prefetched) {
+ // If we didn't retrieve our first data hold batch, we need to do it now.
+ prefetched = true;
+ prefetchFirstBatchFromBothSides();
+
+ // Handle emitting the correct outcome for termination conditions
+ // Use the state set by prefetchFirstBatchFromBothSides to emit the
correct termination outcome.
+ switch (state) {
+ case DONE:
+ return IterOutcome.NONE;
+ case STOP:
+ return IterOutcome.STOP;
+ case OUT_OF_MEMORY:
+ return IterOutcome.OUT_OF_MEMORY;
+ default:
+ // No termination condition so continue processing.
Review comment:
So basically this code was taken from AbstractRecordBatch:next() , following
the buildSchema() , and moved into this innerNext() call. It is a hack.
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> Hash Join returns incorrect data types when joining subqueries with limit 0
> ---------------------------------------------------------------------------
>
> Key: DRILL-6606
> URL: https://issues.apache.org/jira/browse/DRILL-6606
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Bohdan Kazydub
> Assignee: Timothy Farkas
> Priority: Blocker
> Fix For: 1.14.0
>
>
> PreparedStatement for query
> {code:sql}
> SELECT l.l_quantity, l.l_shipdate, o.o_custkey
> FROM (SELECT * FROM cp.`tpch/lineitem.parquet` LIMIT 0) l
> JOIN (SELECT * FROM cp.`tpch/orders.parquet` LIMIT 0) o
> ON l.l_orderkey = o.o_orderkey
> LIMIT 0
> {code}
> is created with wrong types (nullable INTEGER) for all selected columns, no
> matter what their actual type is. This behavior reproduces with hash join
> only and is very likely to be caused by DRILL-6027 as the query works fine
> before this feature was implemented.
> To reproduce the problem you can put the aforementioned query into
> TestPreparedStatementProvider#joinOrderByQuery() test method.
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