Hanifi Gunes created DRILL-3577:
-----------------------------------
Summary: Counting nested fields on CTAS-created-parquet file/s
reports inaccurate results
Key: DRILL-3577
URL: https://issues.apache.org/jira/browse/DRILL-3577
Project: Apache Drill
Issue Type: Bug
Components: Functions - Drill
Affects Versions: 1.1.0
Reporter: Hanifi Gunes
Assignee: Mehant Baid
Priority: Critical
I have not tried this at a smaller scale nor on JSON file directly but the
following seems to re-prod the issue
1. Create an input file as follows
20K rows with the following -
{"some":"yes","others":{"other":"true","all":"false","sometimes":"yes"}}
200 rows with the following -
{"some":"yes","others":{"other":"true","all":"false","sometimes":"yes","additional":"last
entries only"}}
2. CTAS as follows
{code:sql}
CREATE TABLE dfs.`tmp`.`tp` as select * from dfs.`data.json` t
{code}
This should read
{code}
Fragment Number of records written
0_0 20200
{code}
3. Count on nested fields via
{code:sql}
select count(t.others.additional) from dfs.`tmp`.`tp` t
OR
select count(t.others.other) from dfs.`tmp`.`tp` t
{code}
reports no rows as follows
{code}
EXPR$0
0
{code}
While
{code:sql}
select count(t.`some`) from dfs.`tmp`.`tp` t where t.others.additional is not
null
{code}
reports expected 200 rows
{code}
EXPR$0
200
{code}
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