Mehant Baid created DRILL-1309:
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Summary: Projected columns are not pushed into scan
Key: DRILL-1309
URL: https://issues.apache.org/jira/browse/DRILL-1309
Project: Apache Drill
Issue Type: Bug
Reporter: Mehant Baid
While performing the following query on two text files, the projected column
does not get pushed into the scan.
explain plan for select t1.columns[1] from dfs.`/tmp/t1.csv` t1,
dfs.`/tmp/t2.csv` t2 where t1.columns[0] = t2.columns[0];
00-00 Screen
00-01 Project(EXPR$0=[ITEM($0, 1)])
00-02 HashJoin(condition=[=($1, $2)], joinType=[inner])
00-04 Project(columns=[$0], $f2=[ITEM($0, 0)])
00-06 Scan(groupscan=[EasyGroupScan [selectionRoot=/tmp/t1.csv,
columns = [SchemaPath [`columns`], SchemaPath [`columns`[0]]]]])
00-03 Project($f20=[$0])
00-05 Project($f2=[ITEM($0, 0)])
00-07 Scan(groupscan=[EasyGroupScan [selectionRoot=/tmp/t2.csv,
columns = [SchemaPath [`columns`[0]]]]])
In the above plan (00-06) we see that the scan contains the following column
projections pushed into scan: 'columns' and 'columns[0]'.
We should not push 'columns' into the scan, instead push 'columns[1]' which is
the projected column into the scan.
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