SNOW-227101: fix to datetime columns being created without timezone

[Nazarii]

Original ticket.

Commit 28e8031 introduced a bug where all sqlalchemy.DateTime(timezone=True) columns were created as DATETIME in Snowflake which is an alias to TIMESTAMP_NTZ.
This commit reverts datetime logic back so if the timezone is defined in datetime column it will create TIMESTAMP_TZ and TIMESTAMP_NTZ otherwise.
This bug was introduced in v1.1.18

[WeiGuHS]

@Nazarii do you know when this commit can be merged? and also is a reason that take out these TIMESTAMP_TZ from v1.1.8?

[Nazarii]

@WeiGuHS no idea, this PR has no reviewers assigned, the same with the original ticket. I have no permissions to assign PR, I'll try to ping other contributors to review. It looks like the support of TIMESTAMP_TZ was removed by a mistake.

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[Nazarii]

I have read the CLA Document and I hereby sign the CLA

[Nazarii]

Not sure why but this PR shows there are conflicts. Diff does not show any merge conflicts or maybe there are some other conflicts?

[sfc-gh-mkeller]

We will revisit this issue shortly.
In the meantime TIMESTAMP is an alias that is configurable actually, please see our docs to see how to change what it points at.

[philippeboyd]

@sfc-gh-mkeller any news on this?

conflicts comes from GEOGRAPHY being added at the same spot in the file as your modifications

      def visit_TIMESTAMP(self, type_, **kw):
++<<<<<<< HEAD
 +        return "TIMESTAMP"
 +
 +    def visit_GEOGRAPHY(self, type_, **kw):
 +        return "GEOGRAPHY"
++=======
+         is_local = kw.get('is_local', False)
+         timezone = kw.get('timezone', type_.timezone)
+         return "TIMESTAMP %s%s" % (
+             (timezone and "WITH" or "WITHOUT") + (
+                     is_local and " LOCAL" or "") + " TIME ZONE",
+             "(%d)" % type_.precision if getattr(type_, 'precision',
+                                                None) is not None else ""
+         )
++>>>>>>> 9620a0a (SNOW-227101: fix to datetime columns being created without timezone (TIMESTAMP_NTZ).)```