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store/show vcols as item->print()
otherwise we'd need to store sql_mode *per vcol* (consider CREATE INDEX...) and how SHOW CREATE TABLE would support that? Additionally, get rid of vcol::expr_str, just to make sure the string is always generated and never leaked in the original form.
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@ -45,7 +45,7 @@ CHARACTER_SET_NAME varchar(32) YES NULL
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COLLATION_NAME varchar(32) YES NULL
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COLUMN_TYPE longtext NO
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COLUMN_KEY varchar(3) NO
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EXTRA varchar(27) NO
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EXTRA varchar(30) NO
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PRIVILEGES varchar(80) NO
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COLUMN_COMMENT varchar(1024) NO
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SHOW CREATE TABLE information_schema.COLUMNS;
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@ -68,7 +68,7 @@ COLUMNS CREATE TEMPORARY TABLE `COLUMNS` (
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`COLLATION_NAME` varchar(32) DEFAULT NULL,
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`COLUMN_TYPE` longtext NOT NULL DEFAULT '',
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`COLUMN_KEY` varchar(3) NOT NULL DEFAULT '',
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`EXTRA` varchar(27) NOT NULL DEFAULT '',
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`EXTRA` varchar(30) NOT NULL DEFAULT '',
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`PRIVILEGES` varchar(80) NOT NULL DEFAULT '',
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`COLUMN_COMMENT` varchar(1024) NOT NULL DEFAULT ''
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) DEFAULT CHARSET=utf8
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@ -91,7 +91,7 @@ CHARACTER_SET_NAME varchar(32) YES NULL
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COLLATION_NAME varchar(32) YES NULL
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COLUMN_TYPE longtext NO
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COLUMN_KEY varchar(3) NO
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EXTRA varchar(27) NO
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EXTRA varchar(30) NO
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PRIVILEGES varchar(80) NO
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COLUMN_COMMENT varchar(1024) NO
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SELECT table_catalog, table_schema, table_name, column_name
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