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HLL_HASH function return type should be HLL #3652

@HangyuanLiu

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@HangyuanLiu

Currently, the return value of the HLL function is varchar. This result in problems in analyze stage. For example, HLL_RAW_AGG(hll_hash(hll_type_field)) return analyze error: "HLL_UNION_AGG, HLL_RAW_AGG and HLL_CARDINALITY's params must be HLL column".

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area/sql/functionIssues or PRs related to the SQL functionskind/featureCategorizes issue or PR as related to a new feature.

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