[SPARK-7286][SQL] Deprecate !== in favour of =!=
This PR replaces #9925 which had issues with CI. **Please see the original PR for any previous discussions.** ## What changes were proposed in this pull request? Deprecate the SparkSQL column operator !== and use =!= as an alternative. Fixes subtle issues related to operator precedence (basically, !== does not have the same priority as its logical negation, ===). ## How was this patch tested? All currently existing tests. Author: Jakob Odersky <jodersky@gmail.com> Closes #11588 from jodersky/SPARK-7286.
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