Anton Gozhiy created DRILL-6857:
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Summary: Limit is not being pushed into scan when selecting from a
parquet file with multiple row groups.
Key: DRILL-6857
URL: https://issues.apache.org/jira/browse/DRILL-6857
Project: Apache Drill
Issue Type: Bug
Affects Versions: 1.15.0
Reporter: Anton Gozhiy
Attachments: DRILL_5796_test_data.parquet
*Data:*
A parquet file that contains more than one row group. Example is attached.
*Query:*
{code:sql}
explain plan for select * from dfs.tmp.`DRILL_5796_test_data.parquet` limit 1
{code}
*Expected result:*
numFiles=1, numRowGroups=1
*Actual result:*
numFiles=1, numRowGroups=3
{noformat}
00-00 Screen : rowType = RecordType(DYNAMIC_STAR **): rowcount = 1.0,
cumulative cost = {274.1 rows, 280.1 cpu, 270.0 io, 0.0 network, 0.0 memory},
id = 13671
00-01 Project(**=[$0]) : rowType = RecordType(DYNAMIC_STAR **): rowcount =
1.0, cumulative cost = {274.0 rows, 280.0 cpu, 270.0 io, 0.0 network, 0.0
memory}, id = 13670
00-02 SelectionVectorRemover : rowType = RecordType(DYNAMIC_STAR **):
rowcount = 1.0, cumulative cost = {273.0 rows, 279.0 cpu, 270.0 io, 0.0
network, 0.0 memory}, id = 13669
00-03 Limit(fetch=[1]) : rowType = RecordType(DYNAMIC_STAR **):
rowcount = 1.0, cumulative cost = {272.0 rows, 278.0 cpu, 270.0 io, 0.0
network, 0.0 memory}, id = 13668
00-04 Limit(fetch=[1]) : rowType = RecordType(DYNAMIC_STAR **):
rowcount = 1.0, cumulative cost = {271.0 rows, 274.0 cpu, 270.0 io, 0.0
network, 0.0 memory}, id = 13667
00-05 Scan(table=[[dfs, tmp, DRILL_5796_test_data.parquet]],
groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath
[path=maprfs:///tmp/DRILL_5796_test_data.parquet]],
selectionRoot=maprfs:/tmp/DRILL_5796_test_data.parquet, numFiles=1,
numRowGroups=3, usedMetadataFile=false, columns=[`**`]]]) : rowType =
RecordType(DYNAMIC_STAR **): rowcount = 270.0, cumulative cost = {270.0 rows,
270.0 cpu, 270.0 io, 0.0 network, 0.0 memory}, id = 13666
{noformat}
*Note:*
The limit pushdown works with the same data partitioned by files (1 row group
for a file )
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