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https://issues.apache.org/jira/browse/SPARK-17647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16877599#comment-16877599
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Sascha Wiegleb commented on SPARK-17647:
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I have tested this behavior with spark 2.4.2 and it seems to be that the bug is
still there.
With:
{code:java}
spark.sql.parser.escapedStringLiterals=true
{code}
backslash it is working, but I run into failures with escaping " and ' .
{code:java}
the escape character is not allowed to precede '\"'
{code}
I have tested the behavior with the following special characters and their
escaping:
{code:java}
_ % \ ' "
{code}
So both modes will not cover the full spectrum of escaping special characters.
> SQL LIKE does 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
> Assignee: Xiangrui Meng
> Priority: Major
> Labels: correctness
> Fix For: 2.1.1, 2.2.0
>
>
> Try the following in SQL shell:
> {code}
> select '\\\\' like '%\\%';
> {code}
> It returned false, which is wrong.
> cc: [~yhuai] [~joshrosen]
> A false-negative considered previously:
> {code}
> select '\\\\' rlike '.*\\\\\\\\.*';
> {code}
> It returned true, which is correct if we assume that the pattern is treated
> as a Java string but not raw string.
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