add doc for column comment
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@ -91,12 +91,15 @@ ALTER TABLE [db_name.]tb_name alter_table_clause
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alter_table_clause: {
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alter_table_options
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| ADD COLUMN col_name column_type
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| ADD COLUMN col_name column_definition
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| DROP COLUMN col_name
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| MODIFY COLUMN col_name column_type
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| MODIFY COLUMN col_name column_definition
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| RENAME COLUMN old_col_name new_col_name
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}
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column_definition:
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type_name [comment 'string_value']
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alter_table_options:
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alter_table_option ...
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@ -23,7 +23,10 @@ create_subtable_clause: {
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}
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create_definition:
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col_name column_type
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col_name column_definition
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column_definition:
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type_name [comment 'string_value']
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table_options:
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table_option ...
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@ -89,12 +92,15 @@ ALTER TABLE [db_name.]tb_name alter_table_clause
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alter_table_clause: {
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alter_table_options
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| ADD COLUMN col_name column_type
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| ADD COLUMN col_name column_definition
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| DROP COLUMN col_name
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| MODIFY COLUMN col_name column_type
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| MODIFY COLUMN col_name column_definition
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| RENAME COLUMN old_col_name new_col_name
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}
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column_definition:
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type_name [comment 'string_value']
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alter_table_options:
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alter_table_option ...
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