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#pragma once
#include <Columns/ColumnString.h>
#include <Columns/ColumnFixedString.h>
#include <Columns/ColumnConst.h>
#include <DataTypes/DataTypeString.h>
#include <Functions/FunctionFactory.h>
#include <Functions/FunctionHelpers.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_COLUMN;
}
template <typename Impl, typename Name>
class FunctionStringReplace : public IFunction
{
public:
static constexpr auto name = Name::name;
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionStringReplace>(); }
String getName() const override { return name; }
size_t getNumberOfArguments() const override { return 3; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
bool useDefaultImplementationForConstants() const override { return true; }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
FunctionArgumentDescriptors args{
{"haystack", &isStringOrFixedString<IDataType>, nullptr, "String or FixedString"},
{"pattern", &isString<IDataType>, nullptr, "String"},
{"replacement", &isString<IDataType>, nullptr, "String"}
};
validateFunctionArgumentTypes(*this, arguments, args);
return std::make_shared<DataTypeString>();
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override
{
ColumnPtr column_haystack = arguments[0].column;
column_haystack = column_haystack->convertToFullColumnIfConst();
const ColumnPtr column_needle = arguments[1].column;
const ColumnPtr column_replacement = arguments[2].column;
const ColumnString * col_haystack = checkAndGetColumn<ColumnString>(column_haystack.get());
const ColumnFixedString * col_haystack_fixed = checkAndGetColumn<ColumnFixedString>(column_haystack.get());
const ColumnString * col_needle_vector = checkAndGetColumn<ColumnString>(column_needle.get());
const ColumnConst * col_needle_const = checkAndGetColumn<ColumnConst>(column_needle.get());
const ColumnString * col_replacement_vector = checkAndGetColumn<ColumnString>(column_replacement.get());
const ColumnConst * col_replacement_const = checkAndGetColumn<ColumnConst>(column_replacement.get());
auto col_res = ColumnString::create();
if (col_haystack && col_needle_const && col_replacement_const)
{
Impl::vectorConstantConstant(
col_haystack->getChars(), col_haystack->getOffsets(),
col_needle_const->getValue<String>(),
col_replacement_const->getValue<String>(),
col_res->getChars(), col_res->getOffsets());
return col_res;
}
else if (col_haystack && col_needle_vector && col_replacement_const)
{
Impl::vectorVectorConstant(
col_haystack->getChars(), col_haystack->getOffsets(),
col_needle_vector->getChars(), col_needle_vector->getOffsets(),
col_replacement_const->getValue<String>(),
col_res->getChars(), col_res->getOffsets());
return col_res;
}
else if (col_haystack && col_needle_const && col_replacement_vector)
{
Impl::vectorConstantVector(
col_haystack->getChars(), col_haystack->getOffsets(),
col_needle_const->getValue<String>(),
col_replacement_vector->getChars(), col_replacement_vector->getOffsets(),
col_res->getChars(), col_res->getOffsets());
return col_res;
}
else if (col_haystack && col_needle_vector && col_replacement_vector)
{
Impl::vectorVectorVector(
col_haystack->getChars(), col_haystack->getOffsets(),
col_needle_vector->getChars(), col_needle_vector->getOffsets(),
col_replacement_vector->getChars(), col_replacement_vector->getOffsets(),
col_res->getChars(), col_res->getOffsets());
return col_res;
}
else if (col_haystack_fixed && col_needle_const && col_replacement_const)
{
Impl::vectorFixedConstantConstant(
col_haystack_fixed->getChars(), col_haystack_fixed->getN(),
col_needle_const->getValue<String>(),
col_replacement_const->getValue<String>(),
col_res->getChars(), col_res->getOffsets());
return col_res;
}
else
throw Exception(
ErrorCodes::ILLEGAL_COLUMN,
"Illegal column {} of first argument of function {}",
arguments[0].column->getName(), getName());
}
};
}
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