soumyakanti3578 commented on a change in pull request #2514:
URL: https://github.com/apache/hive/pull/2514#discussion_r676864675
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/stats/HiveRelMdDistinctRowCount.java
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@@ -93,6 +89,16 @@ public Double getDistinctRowCount(HiveJoin rel,
RelMetadataQuery mq, ImmutableBi
groupKey, predicate, true);
}
+ public Double getDistinctRowCount(RelNode r, RelMetadataQuery mq,
ImmutableBitSet groupKey,
+ RexNode predicate) {
+ if (r instanceof SingleRel) {
+ return mq.getDistinctRowCount(r.getInput(0), groupKey, predicate);
+ } else if (r instanceof JdbcHiveTableScan) {
+ return getDistinctRowCount(((JdbcHiveTableScan) r).getHiveTableScan(),
mq, groupKey, predicate);
+ }
+
+ return super.getDistinctRowCount(r, mq, groupKey, predicate);
+ }
Review comment:
Added a comment in the method with a brief explanation. Changed
`SingleRel` to `Converter`, and added a method for
`getDistictRowCount(JdbcHiveTableScan...)`.
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