Ratandeep Ratti created HIVE-14351:
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Summary: Minor improvement in genUnionPlan method
Key: HIVE-14351
URL: https://issues.apache.org/jira/browse/HIVE-14351
Project: Hive
Issue Type: Improvement
Affects Versions: 2.1.0
Reporter: Ratandeep Ratti
Assignee: Ratandeep Ratti
{{org.apache.hadoop.hive.ql.parse.SemanticAnalyzer#genUnionPlan}} method can
trip new users reading the code.
Specifically on line 8979
{code}
HashMap<String, ColumnInfo> leftmap = leftRR.getFieldMap(leftalias);
HashMap<String, ColumnInfo> rightmap = rightRR.getFieldMap(rightalias);
{code}
These column maps are actually LinkedHashMaps and the code relies on this fact
when iterating the two union branches in order.
This was not clear immediately and left me wondering how is it that traversal
order is consistent.
I've updated the code with this simple fix.
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