It's a complement to #1533607
You can't create columns with reserved words, like
`natural`, `index`. Column names should get a backtick.
If anyone's interested, I'm making a patch. Mail-me at
bernardojts AT gmail DOT com
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They shouldn't. Different backends use different rules for
quoting. Some backends never allow reserved words however
you quote them.
But please submit your patch to the patch tracker for review.