1. add json_unquote and json_extract functions
2. remove mv releated code in visitPhysicalOlapScan
3. forbid bitmap and hll type for topn node's sort exprs
4. HashDistributionInfo of olap scan node should use the slots from output not the full schema
5. SelectMaterializedIndexWithoutAggregate should use the filter node's output together with the predicate to get the correct mv
6. forbid SimplifyArithmeticRule for decimal type
7. make DecimalLiteral's type and value consistent with each other if the value is decimalv2
8. json_array need support empty argument
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