WinkerDu opened a new pull request, #2627:
URL: https://github.com/apache/arrow-datafusion/pull/2627
# Which issue does this PR close?
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Closes #2626 .
# Rationale for this change
`like`, `not like` expressions doesn't work well with literal `NULL` in DF.
**To Reproduce**
```
> SELECT column1 like NULL from (values('a'), ('b'), (NULL)) as t
Plan("'Utf8 LIKE Null' can't be evaluated because there isn't a common type
to coerce the types to")
```
Postgres works like
```
# SELECT column1 like NULL from (values('a'), ('b'), (NULL)) as t;
?column?
----------
(3 rows)
```
# What changes are included in this PR?
- Introduces `null_coercion` to `like_coercion`
- Enhances `compute_utf8_op_scalar` to produce null array when scalar value
`NULL` inputs.
# Are there any user-facing changes?
No.
# Does this PR break compatibility with Ballista?
No.
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