[BUG] Fix NPE when distinct in predicate push down #4294
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HangyuanLiu
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EmmyMiao87
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Aug 11, 2020
**Describe the bug**
Predicate push down where sub query has distinct may throw NPE
**To Reproduce**
Steps to reproduce the behavior:
1. create table like
```
+--------------+--------------+------+-------+---------+---------+
| Field | Type | Null | Key | Default | Extra |
+--------------+--------------+------+-------+---------+---------+
| event_day | DATETIME | No | true | NULL | |
| title | VARCHAR(600) | No | true | NULL | |
| report_value | VARCHAR(50) | No | false | NULL | REPLACE |
+--------------+--------------+------+-------+---------+---------+
```
2. exec query
```
```SELECT
*
FROM
(
SELECT
DISTINCT event_day,
title
FROM
click_show_window
) a
WHERE
a.title IS NOT NULL
```
4. See error
```
ERROR 1064 (HY000): errCode = 2, detailMessage = Unexpected exception: null
```
This is because DISTINCT generate grouping exprs in agginfo, but this clause does not have a group by clause
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Proposed changes
FIX: #4263
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