CreateQuery database_for_dict_01268 table_for_dict1 (children 4) Identifier database_for_dict_01268 Identifier table_for_dict1 Columns definition (children 1) ExpressionList (children 3) ColumnDeclaration key_column (children 1) DataType UInt64 ColumnDeclaration second_column (children 1) DataType UInt64 ColumnDeclaration third_column (children 1) DataType String Storage definition (children 2) Function MergeTree (children 1) ExpressionList Identifier key_column