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doris/be
lihangyu 9b7596f1c6 [Feature](Dynamic schema table) step1 support schema change expression (#17494)
1. introduce a new type `VARIANT` to encapsulate dynamic generated columns for hidding the detail of types and names of newly generated columns
2. introduce a new expression `SchemaChangeExpr` for doing schema change for extensibility
2023-03-13 15:12:42 +08:00
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