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jiangmanhua commented on CARBONDATA-2695: ----------------------------------------- 1、For datatype: carbon only supports to change datatype of number: Int -> bigInt/Long Decimal -> from lower precision to higher precision Ref code: org.apache.spark.sql.parser.CarbonSpark2SqlParser#alterTableModifyDataType : parseDataType org.apache.spark.sql.execution.command.schema.CarbonAlterTableDataTypeChangeCommand#validateColumnDataType 2、For alter column name: not support. > Block alter name/datatype of the long_string_columns > ---------------------------------------------------- > > Key: CARBONDATA-2695 > URL: https://issues.apache.org/jira/browse/CARBONDATA-2695 > Project: CarbonData > Issue Type: Sub-task > Reporter: xuchuanyin > Assignee: jiangmanhua > Priority: Major > -- This message was sent by Atlassian JIRA (v7.6.3#76005)