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70d1adfe4b
* save format string for NetException * format exceptions * format exceptions 2 * format exceptions 3 * format exceptions 4 * format exceptions 5 * format exceptions 6 * fix * format exceptions 7 * format exceptions 8 * Update MergeTreeIndexGin.cpp * Update AggregateFunctionMap.cpp * Update AggregateFunctionMap.cpp * fix
82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
#include <Functions/IFunction.h>
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#include <Functions/FunctionHelpers.h>
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#include <Functions/FunctionFactory.h>
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#include <DataTypes/DataTypeArray.h>
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#include <Interpreters/ArrayJoinAction.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int FUNCTION_IS_SPECIAL;
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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}
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/** arrayJoin(arr) - a special function - it can not be executed directly;
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* is used only to get the result type of the corresponding expression.
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*/
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class FunctionArrayJoin : public IFunction
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{
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public:
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static constexpr auto name = "arrayJoin";
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static FunctionPtr create(ContextPtr)
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{
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return std::make_shared<FunctionArrayJoin>();
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}
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/// Get the function name.
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String getName() const override
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{
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return name;
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}
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size_t getNumberOfArguments() const override
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{
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return 1;
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}
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/** It could return many different values for single argument. */
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bool isDeterministic() const override
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{
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return false;
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}
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bool isDeterministicInScopeOfQuery() const override
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{
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return false;
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}
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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const auto & arr = getArrayJoinDataType(arguments[0]);
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if (!arr)
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throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Argument for function {} must be Array or Map", getName());
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return arr->getNestedType();
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}
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ColumnPtr executeImpl(const ColumnsWithTypeAndName &, const DataTypePtr &, size_t /*input_rows_count*/) const override
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{
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throw Exception(ErrorCodes::FUNCTION_IS_SPECIAL, "Function {} must not be executed directly.", getName());
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}
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/// Because of function cannot be executed directly.
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bool isSuitableForConstantFolding() const override
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{
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return false;
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}
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};
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REGISTER_FUNCTION(ArrayJoin)
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{
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factory.registerFunction<FunctionArrayJoin>();
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}
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}
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