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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
156 lines
5.1 KiB
C++
156 lines
5.1 KiB
C++
#include <Columns/ColumnFixedString.h>
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#include <Columns/ColumnString.h>
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#include <DataTypes/DataTypeFixedString.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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namespace ErrorCodes
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{
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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extern const int LOGICAL_ERROR;
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extern const int ILLEGAL_COLUMN;
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}
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class FunctionToStringCutToZero : public IFunction
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{
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public:
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static constexpr auto name = "toStringCutToZero";
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static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionToStringCutToZero>(); }
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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 { return 1; }
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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if (!isStringOrFixedString(arguments[0]))
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throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Illegal type {} of argument of function {}",
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arguments[0]->getName(), getName());
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return std::make_shared<DataTypeString>();
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}
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bool useDefaultImplementationForConstants() const override { return true; }
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static bool tryExecuteString(const IColumn * col, ColumnPtr & col_res)
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{
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const ColumnString * col_str_in = checkAndGetColumn<ColumnString>(col);
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if (col_str_in)
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{
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auto col_str = ColumnString::create();
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ColumnString::Chars & out_vec = col_str->getChars();
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ColumnString::Offsets & out_offsets = col_str->getOffsets();
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const ColumnString::Chars & in_vec = col_str_in->getChars();
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const ColumnString::Offsets & in_offsets = col_str_in->getOffsets();
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size_t size = in_offsets.size();
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out_offsets.resize(size);
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out_vec.resize(in_vec.size());
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char * begin = reinterpret_cast<char *>(out_vec.data());
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char * pos = begin;
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ColumnString::Offset current_in_offset = 0;
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for (size_t i = 0; i < size; ++i)
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{
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const char * pos_in = reinterpret_cast<const char *>(&in_vec[current_in_offset]);
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size_t current_size = strlen(pos_in);
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memcpySmallAllowReadWriteOverflow15(pos, pos_in, current_size);
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pos += current_size;
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*pos = '\0';
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++pos;
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out_offsets[i] = pos - begin;
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current_in_offset = in_offsets[i];
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}
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out_vec.resize(pos - begin);
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if (!out_offsets.empty() && out_offsets.back() != out_vec.size())
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throw Exception(ErrorCodes::LOGICAL_ERROR, "Column size mismatch (internal logical error)");
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col_res = std::move(col_str);
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return true;
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}
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else
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{
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return false;
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}
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}
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static bool tryExecuteFixedString(const IColumn * col, ColumnPtr & col_res)
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{
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const ColumnFixedString * col_fstr_in = checkAndGetColumn<ColumnFixedString>(col);
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if (col_fstr_in)
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{
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auto col_str = ColumnString::create();
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ColumnString::Chars & out_vec = col_str->getChars();
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ColumnString::Offsets & out_offsets = col_str->getOffsets();
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const ColumnString::Chars & in_vec = col_fstr_in->getChars();
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size_t size = col_fstr_in->size();
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out_offsets.resize(size);
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out_vec.resize(in_vec.size() + size);
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char * begin = reinterpret_cast<char *>(out_vec.data());
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char * pos = begin;
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const char * pos_in = reinterpret_cast<const char *>(in_vec.data());
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size_t n = col_fstr_in->getN();
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for (size_t i = 0; i < size; ++i)
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{
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size_t current_size = strnlen(pos_in, n);
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memcpySmallAllowReadWriteOverflow15(pos, pos_in, current_size);
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pos += current_size;
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*pos = '\0';
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out_offsets[i] = ++pos - begin;
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pos_in += n;
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}
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out_vec.resize(pos - begin);
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if (!out_offsets.empty() && out_offsets.back() != out_vec.size())
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throw Exception(ErrorCodes::LOGICAL_ERROR, "Column size mismatch (internal logical error)");
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col_res = std::move(col_str);
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return true;
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}
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else
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{
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return false;
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}
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}
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ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override
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{
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const IColumn * column = arguments[0].column.get();
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ColumnPtr res_column;
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if (tryExecuteFixedString(column, res_column) || tryExecuteString(column, res_column))
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return res_column;
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throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column {} of argument of function {}",
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arguments[0].column->getName(), getName());
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}
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};
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REGISTER_FUNCTION(ToStringCutToZero)
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{
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factory.registerFunction<FunctionToStringCutToZero>();
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}
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}
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