Hyukjin Kwon created SPARK-61206:
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Summary: DataType::to_ddl writes the backslashes of a field
comment unescaped
Key: SPARK-61206
URL: https://issues.apache.org/jira/browse/SPARK-61206
Project: Spark
Issue Type: Bug
Components: Connect
Affects Versions: connect-rust-4.3.0
Reporter: Hyukjin Kwon
DataType::to_ddl escapes the single quotes of a COMMENT but not its
backslashes, so the server's DDL parser reads an escape sequence from them. A
comment a\b comes back as a plus a backspace character, and a trailing
backslash or a backslash before a quote breaks the literal. Spark's DDL escapes
the backslashes first, then the quotes, and the official StructType.toDDL
writes 'a\\b' for this comment and reads back a\b.
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