Only for qc_sqlite.
After a second look qc_mysqlembedded will not support dupping
the statement information. Without additional changes, simply stashing
an info object away, parsing another new GWBUF, deleting that and
then using the stashed away info object will not work; the THD object
will be corrupted. As qc_mysqlembedded is _only_ used for verifying the
sqlite-based parser this is not important anyway.
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