Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/406#discussion_r55428219
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ConvertCountToDirectScan.java
---
@@ -103,6 +104,10 @@ public void onMatch(RelOptRuleCall call) {
return;
}
+ if (proj != null && !ProjectRemoveRule.isTrivial(proj)) {
--- End diff --
With the patch, the following query will not use directScan.
{code}
select count(*) from cp.`tpch/nation.parquet`;
{code}
{code}
00-00 Screen : rowType = RecordType(BIGINT EXPR$0): rowcount = 1.0,
cumulative cost = {75.1 rows, 425.1 cpu, 0.0 io, 0.0 network, 0.0 memory}, id =
169
00-01 Project(EXPR$0=[$0]) : rowType = RecordType(BIGINT EXPR$0):
rowcount = 1.0, cumulative cost = {75.0 rows, 425.0 cpu, 0.0 io, 0.0 network,
0.0 memory}, id = 168
00-02 StreamAgg(group=[{}], EXPR$0=[COUNT()]) : rowType =
RecordType(BIGINT EXPR$0): rowcount = 1.0, cumulative cost = {75.0 rows, 425.0
cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 167
00-03 Project($f0=[0]) : rowType = RecordType(INTEGER $f0):
rowcount = 25.0, cumulative cost = {50.0 rows, 125.0 cpu, 0.0 io, 0.0 network,
0.0 memory}, id = 166
00-04 Scan(groupscan=[ParquetGroupScan
[entries=[ReadEntryWithPath [path=classpath:/tpch/nation.parquet]],
selectionRoot=classpath:/tpch/nation.parquet, numFiles=1,
usedMetadataFile=false, columns=[]]]) : rowType = RecordType(): rowcount =
25.0, cumulative cost = {25.0 rows, 25.0 cpu, 0.0 io, 0.0 network, 0.0 memory},
id = 165
{code}
I debug a bit. Seems Line 115 is fine. But something is worng in the code
Line 117 - 123.
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