Convert a long string to a TEXT data type column

When a string fills half a disk page or more, consider converting it to a TEXT data type column in a separate blobspace.

The column within the row page is only 56 bytes long, which allows more rows on a page than when you include a long string. However, the TEXT data type is not automatically compatible with existing programs. The application needed to fetch a TEXT value is a bit more complicated than the code for fetching a CHAR value into a program.

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