support mysql8+ default values for text data types #7242
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mysql requires text type column defaults to be written as expressions
https://dev.mysql.com/doc/refman/8.0/en/data-type-defaults.html
=> correct mysql8+ syntax is:
DEFAULT ('text literal')
Summary
mysql8+ does support default values for text typed columns (text, blob, json, geometry)
doctrine disallows this and silently drops the default value