Jungtaek Lim created SPARK-29281:
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Summary: Examples in Like/RLike doesn't consider the default value
of spark.sql.parser.escapedStringLiterals
Key: SPARK-29281
URL: https://issues.apache.org/jira/browse/SPARK-29281
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.0.0
Reporter: Jungtaek Lim
Please take a look at example of `LIKE`:
[https://github.com/apache/spark/blob/d72f39897b00d0bbd7a4db9de281a1256fcf908d/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala#L97-L106]
If spark.sql.parser.escapedStringLiterals=false, then it should fail as there's
`\U` in pattern (spark.sql.parser.escapedStringLiterals=false by default) but
it doesn't fail.
{quote}The escape character is '\'. If an escape character precedes a special
symbol or another
escape character, the following character is matched literally. It is invalid
to escape
any other character.
{quote}
For the query
{code:java}
SET spark.sql.parser.escapedStringLiterals=false;
SELECT '%SystemDrive%\Users\John' like '\%SystemDrive\%\Users%'; {code}
SQL parser removes single `\` (not sure that is intended) so the expressions of
Like are constructed as following:
{code:java}
LIKE - left `%SystemDrive%UsersJohn` / right `\%SystemDrive\%Users%`{code}
which are no longer having origin intention.
Same happens on RLike example:
{code:java}
SET spark.sql.parser.escapedStringLiterals=false;
SELECT '%SystemDrive%\Users\John' rlike '%SystemDrive%\Users.*'; {code}
{code:java}
RLIKE - left `%SystemDrive%UsersJohn` / right `%SystemDrive%Users.*`{code}
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