Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3715#discussion_r125421732
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/datastream/DataStreamWindowJoinRule.scala
---
@@ -20,28 +20,60 @@ package org.apache.flink.table.plan.rules.datastream
import org.apache.calcite.plan.{RelOptRule, RelOptRuleCall, RelTraitSet}
import org.apache.calcite.rel.RelNode
+import org.apache.calcite.rel.`type`.RelDataType
import org.apache.calcite.rel.convert.ConverterRule
+import org.apache.calcite.rex.RexNode
+import org.apache.flink.table.api.{TableConfig, TableException}
import org.apache.flink.table.plan.nodes.FlinkConventions
-import org.apache.flink.table.plan.nodes.datastream.DataStreamRowStreamJoin
+import org.apache.flink.table.plan.nodes.datastream.DataStreamWindowJoin
import org.apache.flink.table.plan.nodes.logical.FlinkLogicalJoin
import org.apache.flink.table.plan.schema.RowSchema
-import org.apache.flink.table.runtime.join.JoinUtil
+import org.apache.flink.table.runtime.join.WindowJoinUtil
-class DataStreamRowStreamJoinRule
+class DataStreamWindowJoinRule
extends ConverterRule(
classOf[FlinkLogicalJoin],
FlinkConventions.LOGICAL,
FlinkConventions.DATASTREAM,
"DataStreamJoinRule") {
+ /** Time indicator type **/
+ private var timeType: RelDataType = _
--- End diff --
I'm not sure if we can store these values as local variables. It kind
assumes that the rule is called in a certain way (first check `matches()` and
immediately after that `convert()`. The rule might also be called concurrently
from different threads. I'd rather run the same analysis again in `convert()`.
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