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40 lines
1.0 KiB
C++
40 lines
1.0 KiB
C++
#include <Interpreters/castColumn.h>
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#include <Interpreters/ExpressionActions.h>
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#include <DataTypes/DataTypeString.h>
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#include <Functions/FunctionFactory.h>
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namespace DB
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{
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ColumnPtr castColumn(const ColumnWithTypeAndName & arg, const DataTypePtr & type, const Context & context)
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{
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if (arg.type->equals(*type))
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return arg.column;
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Block temporary_block
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{
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arg,
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{
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DataTypeString().createColumnConst(arg.column->size(), type->getName()),
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std::make_shared<DataTypeString>(),
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""
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},
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{
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nullptr,
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type,
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""
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}
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};
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FunctionBuilderPtr func_builder_cast = FunctionFactory::instance().get("CAST", context);
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ColumnsWithTypeAndName arguments{ temporary_block.getByPosition(0), temporary_block.getByPosition(1) };
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auto func_cast = func_builder_cast->build(arguments);
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func_cast->execute(temporary_block, {0, 1}, 2, arg.column->size());
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return temporary_block.getByPosition(2).column;
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}
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}
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