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Posted to reviews@spark.apache.org by "cloud-fan (via GitHub)" <gi...@apache.org> on 2023/09/22 01:04:06 UTC
[GitHub] [spark] cloud-fan commented on a diff in pull request #43037: [SPARK-45262][SQL][TESTS][DOCS] Improve examples for `LIKE`
cloud-fan commented on code in PR #43037:
URL: https://github.com/apache/spark/pull/43037#discussion_r1333758923
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala:
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@@ -105,13 +105,15 @@ abstract class StringRegexExpression extends BinaryExpression
Examples:
> SELECT _FUNC_('Spark', '_park');
true
+ > SELECT '\\abc' AS S, S _FUNC_ R'\\abc', S _FUNC_ '\\\\abc';
+ \abc true true
> SET spark.sql.parser.escapedStringLiterals=true;
spark.sql.parser.escapedStringLiterals true
> SELECT '%SystemDrive%\Users\John' _FUNC_ '\%SystemDrive\%\\Users%';
true
> SET spark.sql.parser.escapedStringLiterals=false;
spark.sql.parser.escapedStringLiterals false
- > SELECT '%SystemDrive%\\Users\\John' _FUNC_ '\%SystemDrive\%\\\\Users%';
Review Comment:
it looks to me that we follow the java string semantic: if you write `"\\abc"`, you actually get `\abc`. Is it also true in simple `SELECT` not `LIKE`?
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