ulysses-you commented on a change in pull request #26860: [SPARK-30230][SQL]
Like ESCAPE syntax can not use '_' and '%'
URL: https://github.com/apache/spark/pull/26860#discussion_r357020145
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
##########
@@ -1393,6 +1393,10 @@ class AstBuilder(conf: SQLConf) extends
SqlBaseBaseVisitor[AnyRef] with Logging
}
str.charAt(0)
}.getOrElse('\\')
+ if (Set('%', '_').contains(escapeChar)) {
+ throw new ParseException("Invalid escape string." +
+ "Escape string can not be '%', '_'.", ctx)
+ }
Review comment:
You mean like this ?
```
ESCAPE_STRING
: '\'' ( ~('\''|'\\') | ('\\' .) | ~('%' | '_') )* '\''
| '\'' ( ~('\''|'\\') | ('\\' .) | ~('%' | '_') )* '\''
;
NOT? kind=LIKE pattern=valueExpression (ESCAPE escapeChar=ESCAPE_STRING)?
```
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