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https://issues.apache.org/jira/browse/SPARK-17647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15517656#comment-15517656
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Josh Rosen edited comment on SPARK-17647 at 9/23/16 9:52 PM:
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Another piece of evidence to help untangle this:
In MySQL,
{code}
select '\\' like '\\', '\\' rlike '\\\\';
{code}
returns {{true}} for both columns, illustrating that {{like}} and {{rlike}}
seem to have different escaping rules.
However,
{code}
select
'\\' like '\\\\',
'\\' like '\\'
{code}
returns {{true}} for both columns in MySQL and {{true, false}} in Postgres.
was (Author: joshrosen):
Another piece of evidence to help untangle this:
In MySQL,
{code}
select '\\' like '\\', '\\' rlike '\\\\';
{code}
returns {{true}} for both columns, illustrating that {{like}} and {{rlike}}
seem to have different escaping rules.
> SQL LIKE/RLIKE do not handle backslashes correctly
> --------------------------------------------------
>
> Key: SPARK-17647
> URL: https://issues.apache.org/jira/browse/SPARK-17647
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Xiangrui Meng
> Labels: correctness
>
> Try the following in SQL shell:
> {code}
> select '\\\\' like '%\\%';
> select '\\\\' rlike '.*\\\\\\\\.*';
> {code}
> The first returned false and the second returned true. Both are wrong.
> cc: [~yhuai] [~joshrosen]
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