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  1. Calcite
  2. CALCITE-4872

UNKNOWN SqlTypeName erroneously treated as NULL

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      Call createWithNullability on an UnknownSqlType currently returns a NULL type. Furthermore, it's impossible to cast to unknown types, according to SqlTypeUtil.canCastFrom. This introduces a new SqlTypeNameUNKNOWN – which behaves like NULL in all ways except that it's no longer actually equal to NULL, and can always be cast to.

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            wnoble Will Noble
            wnoble Will Noble
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