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* SQL: Update to Calcite 1.17.0. Other than keeping things fresh, another motivation is that this fixes CALCITE-1436 (AggregateNode NPE for aggregators other than SUM/COUNT), which affects aggregate functions on our system tables. Also sets shouldConvertRaggedUnionTypesToVarying = true, a new type system parameter that prefers VARCHAR over CHAR. This is better for Druid, because we don't really have support for a true CHAR type. * Remove unused import.