b41sh opened a new pull request #870:
URL: https://github.com/apache/arrow-datafusion/pull/870
# Which issue does this PR close?
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Closes #795
# Rationale for this change
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the issue then this section is not needed.
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Implement PostgreSQL pattern matching operator
# What changes are included in this PR?
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sometimes worth providing a summary of the individual changes in this PR.
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1. modify sqlparser to support PostgreSQL regex match syntax
[sqlparser-rs#328](https://github.com/ballista-compute/sqlparser-rs/pull/328)
2. use arrow-rs kernel `regexp_match` function to do regular expression
# Are there any user-facing changes?
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support pattern matching using POSIX regular expressions
```
> CREATE EXTERNAL TABLE X STORED AS PARQUET LOCATION
'./benchmarks/parquet/nation/';
0 rows in set. Query took 0.005 seconds.
> select n_name from X where n_name ~ '^[A-D]';
+-----------+
| n_name |
+-----------+
| ARGENTINA |
| BRAZIL |
| CANADA |
| CHINA |
+-----------+
4 rows in set. Query took 0.010 seconds.
> select n_name from X where n_name ~* '^[a-d]';
+-----------+
| n_name |
+-----------+
| ARGENTINA |
| BRAZIL |
| CANADA |
| CHINA |
+-----------+
4 rows in set. Query took 0.008 seconds.
> select n_name from X where n_name !~ '^[C-R]';
+----------------+
| n_name |
+----------------+
| ARGENTINA |
| BRAZIL |
| SAUDI ARABIA |
| VIETNAM |
| UNITED KINGDOM |
| UNITED STATES |
+----------------+
6 rows in set. Query took 0.009 seconds.
> select n_name from X where n_name !~* '^[c-r]';
+----------------+
| n_name |
+----------------+
| ARGENTINA |
| BRAZIL |
| SAUDI ARABIA |
| VIETNAM |
| UNITED KINGDOM |
| UNITED STATES |
+----------------+
6 rows in set. Query took 0.009 seconds.
```
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