Boaz Ben-Zvi created DRILL-5755:
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Summary: TOP_N_SORT operator does not free memory while running
Key: DRILL-5755
URL: https://issues.apache.org/jira/browse/DRILL-5755
Project: Apache Drill
Issue Type: Bug
Components: Execution - Relational Operators
Affects Versions: 1.11.0
Reporter: Boaz Ben-Zvi
The TOP_N_SORT operator should keep the top N rows while processing its input,
and free the memory used to hold all rows below the top N.
For example, the following query uses a table with 125M rows:
{code}
select row_count, sum(row_count), avg(double_field), max(double_rand),
count(float_rand) from dfs.`/data/tmp` group by row_count order by row_count
limit 30;
{code}
And failed with an OOM when each of the 3 TOP_N_SORT operators was holding
about 2.44 GB !! (see attached profile). It should take far less memory to
hold 30 rows !!
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