jeyhunkarimov commented on code in PR #24239:
URL: https://github.com/apache/flink/pull/24239#discussion_r1477427252
##########
flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/planner/plan/utils/RelTreeWriterImpl.scala:
##########
@@ -286,4 +297,45 @@ class RelTreeWriterImpl(
})
}
}
+
+ private def copy(pw: PrintWriter): RelTreeWriterImpl = {
+ new RelTreeWriterImpl(
+ pw,
+ explainLevel,
+ withIdPrefix,
+ withChangelogTraits,
+ withRowType,
+ withTreeStyle,
+ withUpsertKey,
+ withQueryHint,
+ withQueryBlockAlias,
+ statementNum,
+ withAdvice,
+ withRicherDetailInSubQuery)
+ }
+
+ /**
+ * Mainly copy from [[RexSubQuery#computeDigest]].
+ *
+ * Modified to support explain sub-query with richer additional detail by
[[RelTreeWriterImpl]] in
+ * Flink rather than Calcite.
+ */
+ private def computeSubQueryRicherDigest(subQuery: RexSubQuery): String = {
+ val sb = new StringBuilder(subQuery.getOperator.getName);
+ sb.append("(")
+ subQuery.getOperands.forEach(
+ operand => {
+ sb.append(operand)
+ sb.append(", ")
+ })
+ sb.append("{\n")
+
+ val sw = new StringWriter
+ val newRelTreeWriter = copy(new PrintWriter(sw))
+ subQuery.rel.explain(newRelTreeWriter)
+ sb.append(sw.toString)
+
+ sb.append("})")
+ sb.toString()
+ }
Review Comment:
Makes sense. I lost this relationship/reasoning after force pushes :)
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