godfreyhe commented on a change in pull request #8578: [FLINK-12685]
[table-planner-blink] Supports UNNEST query in blink planner
URL: https://github.com/apache/flink/pull/8578#discussion_r290624047
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File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/plan/rules/FlinkBatchRuleSets.scala
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@@ -119,7 +119,9 @@ object FlinkBatchRuleSets {
new CoerceInputsRule(classOf[LogicalMinus], false),
ConvertToNotInOrInRule.INSTANCE,
// optimize limit 0
- FlinkLimit0RemoveRule.INSTANCE
+ FlinkLimit0RemoveRule.INSTANCE,
+ // unnest rule
+ LogicalUnnestRule.INSTANCE
Review comment:
`decorrelate` replaces all correlated expressions in RelNode with
non-correlated expressions.
while `LogicalUnnestRule` rewrites `LogicalCorrelate` on `Uncollect` pattern
to `LogicalCorrelate` on `LogicalTableFunctionScan` with `explode`, which will
be converted to physical Correlate in physical optimization phase. so
`LogicalUnnestRule` should be put in `DEFAULT_REWRITE`.
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