Fully support SQL statements in SQL Connector

(Migrated from https://github.com/syndesisio/syndesis/issues/5084)

Author: Andrej Smigala
Assignees: unassigned

This is a...

[pre][code]
[x] Feature request
[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report [!-- Please search GitHub for a similar issue or PR before submitting --]
[ ] Documentation issue or request
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Description

The SQL validator in SQL connnection currently supports a somewhat limited subset of SQL (see #5016 for examples). I suggest using a full featured SQL parser rather than trying to address each of these ad-hoc.