mdayakar commented on code in PR #6055:
URL: https://github.com/apache/hive/pull/6055#discussion_r2321279664
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ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/HiveCalciteUtil.java:
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@@ -1272,6 +1272,28 @@ public static boolean
hasAllExpressionsFromRightSide(RelNode joinRel, List<RexNo
return true;
}
+ /**
+ * Checks the operands in the join conditions are from right table or only
from left table.
+ *
+ * @param joinRel Join node
+ * @return true if the join condition operands are from right and left
table, false otherwise.
+ */
+ public static boolean hasJoinConditionOperandFromRightTable(Join joinRel) {
+ RexNode condition = joinRel.getCondition();
+ RelNode leftRel = joinRel.getLeft();
+ int leftFieldCount = leftRel.getRowType().getFieldCount();
+ ImmutableBitSet leftBitmap = ImmutableBitSet.range(leftFieldCount);
+ List<RexNode> conditions = RelOptUtil.conjunctions(condition);
+ for (RexNode cond : conditions) {
+ ImmutableBitSet condBitmap = RelOptUtil.InputFinder.bits(cond);
+ // if condition becomes true if both the operands are from left table
Review Comment:
Modified the comment
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