godfreyhe commented on a change in pull request #8878:
[FLINK-12971][table-planner-blink] Remove the constraint that lookup join needs
a primary key or index key
URL: https://github.com/apache/flink/pull/8878#discussion_r297461744
##########
File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/plan/nodes/common/CommonLookupJoin.scala
##########
@@ -85,19 +84,14 @@ abstract class CommonLookupJoin(
with FlinkRelNode {
val joinKeyPairs: Array[IntPair] = getTemporalTableJoinKeyPairs(joinInfo,
calcOnTemporalTable)
- val indexKeys: Array[TableIndex] = getTableIndexes(tableSource)
// all potential index keys, mapping from field index in table source to
LookupKey
val allLookupKeys: Map[Int, LookupKey] = analyzeLookupKeys(
cluster.getRexBuilder,
joinKeyPairs,
- indexKeys,
tableSource.getTableSchema,
calcOnTemporalTable)
// the matched best lookup fields which is in defined order, maybe empty
- val matchedLookupFields: Option[Array[Int]] = findMatchedIndex(
- indexKeys,
- tableSource.getTableSchema,
- allLookupKeys)
+ val matchedLookupFields: Option[Array[Int]] = findMatchedIndex(allLookupKeys)
Review comment:
matchedLookupFields could be removed
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