snuyanzin commented on code in PR #29697:
URL: https://github.com/apache/flink/pull/29697#discussion_r4436576408
##########
flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/nodes/physical/stream/StreamPhysicalMultiJoin.java:
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@@ -247,6 +247,25 @@ public int[] getJoinKeyIndices(int inputId) {
return keyExtractor.getJoinKeyIndices(inputId);
}
+ /**
+ * Returns the columns that the equi-join conditions of the given input
reference in the inputs
+ * before it, as indices into the row that joins those inputs. The input's
own columns of these
+ * conditions are returned by {@link #getJoinKeyIndices(int)}.
+ */
+ public int[] getLeftJoinKeyIndices(int inputId) {
+ final List<ConditionAttributeRef> attributes =
joinAttributeMap.get(inputId);
+ if (inputId == 0 || attributes == null) {
+ return new int[0];
+ }
+ final int[] offsets = new int[inputId];
+ for (int i = 1; i < inputId; i++) {
+ offsets[i] = offsets[i - 1] + inputs.get(i -
1).getRowType().getFieldCount();
+ }
Review Comment:
do we have a test covering this?
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