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Clickhouse: remove nullable mapping (#1344)
It appears timeseries performance is a common use-case for Clickhouse, wherein users often index based on a `DateTime` column. Clickhouse does not allow indexing based on `Nullable` columns. Also having nullable columns decreases performance. Thus, this PR chooses to stay with the original mapping of DateTime and Date (without the Nullable) A decision is to be made in the future regarding whether we get user's preference on setting a column as Nullable or not for Clickhouse mirrors
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