Kent Yao created SPARK-37452:
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Summary: Char and Varchar breaks backward compatibility between v3
and v2
Key: SPARK-37452
URL: https://issues.apache.org/jira/browse/SPARK-37452
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.2.0, 3.1.2
Reporter: Kent Yao
We will store table schema in table properties for the read-side to restore. In
Spark 3.1, we add char/varchar support natively. In some commands like `create
table`, `alter table` with these types, the char(n) or varchar(n) will be
stored directly to those properties. If a user uses Spark 2 to read such a
table it will fail to parse the schema.
A table can be a newly created one by Spark 3.1 and later or an existing one
modified by Spark 3.1 and on.
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