Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/10723#discussion_r51074937
--- Diff:
sql/catalyst/src/main/antlr3/org/apache/spark/sql/catalyst/parser/SparkSqlLexer.g
---
@@ -465,7 +467,7 @@ Identifier
fragment
QuotedIdentifier
:
- '`' ( '``' | ~('`') )* '`' { setText(getText().substring(1,
getText().length() -1 ).replaceAll("``", "`")); }
+ '`' ( '``' | ~('`') )* '`' { setText(getText().replaceAll("``",
"`")); }
--- End diff --
`QuotedIdentifier` originally strips first and last backticks. So we don't
know if an identifier is quoted or not. In create table ddl commands, you can
specify a column name with quoted string to use special characters. If we strip
backticks early at `QuotedIdentifier`, then we can not have these column names
passed in. So I change it to not strip the first and last backticks and use
`cleanIdentifier` to get rid of the backticks.
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