kgyrtkirk commented on a change in pull request #1286:
URL: https://github.com/apache/hive/pull/1286#discussion_r569549445
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File path: ql/src/java/org/apache/hadoop/hive/ql/exec/OperatorUtils.java
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@@ -654,11 +655,18 @@ public static String findTableColNameOf(Operator<?>
start, String internalColNam
continue;
}
// If columnName is the output of a ColumnExpr get the original
columnName from the Expr Map
- if (currentOp.getColumnExprMap() != null &&
currentOp.getColumnExprMap().containsKey(internalColName)
- && currentOp.getColumnExprMap().get(internalColName) instanceof
ExprNodeColumnDesc) {
- internalColName = ((ExprNodeColumnDesc)
currentOp.getColumnExprMap().get(internalColName)).getColumn();
+ if (currentOp.getColumnExprMap() != null &&
currentOp.getColumnExprMap().containsKey(internalColName)) {
+ // Only use colInfo that is ExprNodeColumnDesc (could even be a UDF on
the key at this point)
+ if (currentOp.getColumnExprMap().get(internalColName) instanceof
ExprNodeColumnDesc) {
+ internalColName = ((ExprNodeColumnDesc)
currentOp.getColumnExprMap().get(internalColName)).getColumn();
+ keyColInfo = currentOp.getSchema().getColumnInfo(internalColName);
Review comment:
this doesn't look right to me; these 2 lines are mapping back to the
previous ops colname and look it up on the current operator - if this does fix
some issue for you ; then I guess there were already some issue with the
mapping/schema - I think the original bug should be fixed in this case; because
the output of the above loopback might be undefined
I think this fix may cause troubles later...
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