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added collation processing in UNION merging
temporary table BLOB now is longblob mysql-test/r/create.result: blob size changed for safety mysql-test/r/type_blob.result: blob size changed for safety mysql-test/r/type_ranges.result: blob size changed for safety mysql-test/r/union.result: blob size changed for safety new tests of UNION types merging mysql-test/t/union.test: new tests of UNION types merging sql/field.h: blob size changed for safety sql/item.cc: processing of collation added added comment sql/item.h: joining of UNION fields may failed now, because of incompatibility of collations sql/sql_union.cc: joining of UNION fields may failed now, because of incompatibility of collations
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@ -404,7 +404,7 @@ d date 0000-00-00
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e char(1)
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f datetime 0000-00-00 00:00:00
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g time 00:00:00
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h mediumblob
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h longblob
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dd time 00:00:00
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select * from t2;
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a b c d e f g h dd
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