danny0405 opened a new pull request #1382: [CALCITE-3250] Support nested collection type for SqlDataTypeSpec URL: https://github.com/apache/calcite/pull/1382 Changes: * Add a new SqlTypeNameSpec SqlCollectionTypeNameSpec to describe nested collections type * Refactor SqlDataTypeSpec to only keep SqlTypeNameSpec, TimeZone and nullble. * Add a new method SqlTypeNameSpec#deriveType(SqlValidator) to support derive type for UDT(throws exception when we can't deduce any type).
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