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https://issues.apache.org/jira/browse/DRILL-5822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16216742#comment-16216742
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Vitalii Diravka commented on DRILL-5822:
----------------------------------------
[~prasadns14]
With "order by" clause I have reproduced the issue. Moreover empty files are
not necessary to hit the issue.
The necessary conditions are:
1. `planner.slice_target` = 1;
2. ORDER BY clause in the query.
I brought this jira description into correspondence.
Eventually DRILL-5845 is other issue. But this issue is reproduced for
TopNBatch operator as well:
{code}
0: jdbc:drill:zk=local> alter session reset `planner.slice_target`;
+-------+--------------------------------+
| ok | summary |
+-------+--------------------------------+
| true | planner.slice_target updated. |
+-------+--------------------------------+
1 row selected (0.082 seconds)
0: jdbc:drill:zk=local> select * from cp.`tpch/nation.parquet` order by n_name
limit 1;
+--------------+----------+--------------+------------------------------------------------------+
| n_nationkey | n_name | n_regionkey | n_comment
|
+--------------+----------+--------------+------------------------------------------------------+
| 0 | ALGERIA | 0 | haggle. carefully final deposits
detect slyly agai |
+--------------+----------+--------------+------------------------------------------------------+
1 row selected (0.141 seconds)
0: jdbc:drill:zk=local> alter session set `planner.slice_target`=1;
+-------+--------------------------------+
| ok | summary |
+-------+--------------------------------+
| true | planner.slice_target updated. |
+-------+--------------------------------+
1 row selected (0.091 seconds)
0: jdbc:drill:zk=local> select * from cp.`tpch/nation.parquet` order by n_name
limit 1;
+------------------------------------------------------+----------+--------------+--------------+
| n_comment | n_name | n_nationkey
| n_regionkey |
+------------------------------------------------------+----------+--------------+--------------+
| haggle. carefully final deposits detect slyly agai | ALGERIA | 0
| 0 |
+------------------------------------------------------+----------+--------------+--------------+
1 row selected (0.201 seconds)
{code}
> Select * on directory containing multiple json files (one or more empty) with
> same schema doesn't preserve column order
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: DRILL-5822
> URL: https://issues.apache.org/jira/browse/DRILL-5822
> Project: Apache Drill
> Issue Type: Bug
> Components: Storage - JSON
> Affects Versions: 1.11.0
> Reporter: Prasad Nagaraj Subramanya
> Assignee: Vitalii Diravka
> Fix For: 1.12.0
>
>
> Repro steps
> 1) Have multiple json files in a directory having the same schema
> 2) Also have one or more empty files
> Scenarios
> 1) Only one minor fragment{code}select * from dfs.`/json_dir`;{code}
> {code}Result:
> +----------+------------+------------------------------------------+-----------------+-----------+----------------------------+---------+--------------+----------------+------------------------+
> | row_key | p_partkey | p_name |
> p_mfgr | p_brand | p_type | p_size | p_container
> | p_retailprice | p_comment |
> +----------+------------+------------------------------------------+-----------------+-----------+----------------------------+---------+--------------+----------------+------------------------+
> | 1 | 1 | goldenrod lace spring peru powder |
> Manufacturer#1 | Brand#13 | PROMO BURNISHED COPPER | 7 | JUMBO
> PKG | 901.0 | ly. slyly ironi |
> | 2 | 2 | blush rosy metallic lemon navajo |
> Manufacturer#1 | Brand#13 | LARGE BRUSHED BRASS | 1 | LG CASE
> | 902.0 | lar accounts amo |
> {code}
> 2) One minor fragment per file
> {code}alter session set `planner.slice_target`=1;
> select * from dfs.`/json_dir`;{code}
> Result:
> {code}
> +-----------+------------------------+--------------+-----------------+------------------------------------------+------------+----------------+---------+----------------------------+----------+
> | p_brand | p_comment | p_container | p_mfgr |
> p_name | p_partkey | p_retailprice | p_size |
> p_type | row_key |
> +-----------+------------------------+--------------+-----------------+------------------------------------------+------------+----------------+---------+----------------------------+----------+
> | Brand#13 | ly. slyly ironi | JUMBO PKG | Manufacturer#1 |
> goldenrod lace spring peru powder | 1 | 901.0 | 7
> | PROMO BURNISHED COPPER | 1 |
> | Brand#13 | lar accounts amo | LG CASE | Manufacturer#1 | blush
> rosy metallic lemon navajo | 2 | 902.0 | 1 |
> LARGE BRUSHED BRASS | 2 |
> {code}
>
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