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588 lines
19 KiB
C++
588 lines
19 KiB
C++
#pragma once
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#include <DataTypes/DataTypeArray.h>
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#include <DataTypes/DataTypeString.h>
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#include <Columns/ColumnString.h>
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#include <Columns/ColumnFixedString.h>
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#include <Columns/ColumnConst.h>
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#include <Columns/ColumnArray.h>
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#include <Common/StringUtils/StringUtils.h>
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#include <Common/typeid_cast.h>
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#include <Common/assert_cast.h>
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#include <Functions/IFunctionImpl.h>
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#include <Functions/Regexps.h>
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#include <Functions/FunctionHelpers.h>
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#include <IO/WriteHelpers.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 NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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extern const int BAD_ARGUMENTS;
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extern const int ILLEGAL_COLUMN;
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}
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/** Functions that split strings into an array of strings or vice versa.
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*
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* splitByChar(sep, s)
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* splitByString(sep, s)
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* splitByRegexp(regexp, s)
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*
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* extractAll(s, regexp) - select from the string the subsequences corresponding to the regexp.
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* - first subpattern, if regexp has subpattern;
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* - zero subpattern (the match part, otherwise);
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* - otherwise, an empty array
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*
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* arrayStringConcat(arr)
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* arrayStringConcat(arr, delimiter)
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* - join an array of strings into one string via a separator.
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*
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* alphaTokens(s) - select from the string subsequence `[a-zA-Z]+`.
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*
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* URL functions are located separately.
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*/
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using Pos = const char *;
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/// Substring generators. All of them have a common interface.
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class AlphaTokensImpl
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{
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private:
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Pos pos;
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Pos end;
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public:
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/// Get the name of the function.
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static constexpr auto name = "alphaTokens";
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static String getName() { return name; }
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static size_t getNumberOfArguments() { return 1; }
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/// Check the type of the function's arguments.
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static void checkArguments(const DataTypes & arguments)
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{
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if (!isString(arguments[0]))
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throw Exception("Illegal type " + arguments[0]->getName() + " of first argument of function " + getName() + ". Must be String.",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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}
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/// Initialize by the function arguments.
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void init(Block & /*block*/, const ColumnNumbers & /*arguments*/) {}
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/// Called for each next string.
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void set(Pos pos_, Pos end_)
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{
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pos = pos_;
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end = end_;
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}
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/// Returns the position of the argument, that is the column of strings
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size_t getStringsArgumentPosition()
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{
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return 0;
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}
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/// Get the next token, if any, or return false.
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bool get(Pos & token_begin, Pos & token_end)
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{
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/// Skip garbage
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while (pos < end && !isAlphaASCII(*pos))
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++pos;
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if (pos == end)
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return false;
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token_begin = pos;
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while (pos < end && isAlphaASCII(*pos))
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++pos;
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token_end = pos;
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return true;
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}
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};
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class SplitByCharImpl
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{
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private:
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Pos pos;
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Pos end;
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char sep;
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public:
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static constexpr auto name = "splitByChar";
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static String getName() { return name; }
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static size_t getNumberOfArguments() { return 2; }
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static void checkArguments(const DataTypes & arguments)
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{
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if (!isString(arguments[0]))
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throw Exception("Illegal type " + arguments[0]->getName() + " of first argument of function " + getName() + ". Must be String.",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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if (!isString(arguments[1]))
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throw Exception("Illegal type " + arguments[1]->getName() + " of second argument of function " + getName() + ". Must be String.",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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}
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void init(Block & block, const ColumnNumbers & arguments)
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{
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const ColumnConst * col = checkAndGetColumnConstStringOrFixedString(block.getByPosition(arguments[0]).column.get());
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if (!col)
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throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
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+ " of first argument of function " + getName() + ". Must be constant string.",
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ErrorCodes::ILLEGAL_COLUMN);
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String sep_str = col->getValue<String>();
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if (sep_str.size() != 1)
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throw Exception("Illegal separator for function " + getName() + ". Must be exactly one byte.", ErrorCodes::BAD_ARGUMENTS);
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sep = sep_str[0];
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}
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/// Returns the position of the argument, that is the column of strings
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size_t getStringsArgumentPosition()
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{
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return 1;
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}
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void set(Pos pos_, Pos end_)
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{
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pos = pos_;
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end = end_;
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}
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bool get(Pos & token_begin, Pos & token_end)
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{
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if (!pos)
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return false;
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token_begin = pos;
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pos = reinterpret_cast<Pos>(memchr(pos, sep, end - pos));
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if (pos)
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{
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token_end = pos;
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++pos;
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}
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else
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token_end = end;
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return true;
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}
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};
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class SplitByStringImpl
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{
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private:
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Pos pos;
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Pos end;
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String sep;
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public:
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static constexpr auto name = "splitByString";
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static String getName() { return name; }
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static size_t getNumberOfArguments() { return 2; }
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static void checkArguments(const DataTypes & arguments)
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{
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SplitByCharImpl::checkArguments(arguments);
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}
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void init(Block & block, const ColumnNumbers & arguments)
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{
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const ColumnConst * col = checkAndGetColumnConstStringOrFixedString(block.getByPosition(arguments[0]).column.get());
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if (!col)
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throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
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+ " of first argument of function " + getName() + ". Must be constant string.",
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ErrorCodes::ILLEGAL_COLUMN);
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sep = col->getValue<String>();
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}
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/// Returns the position of the argument that is the column of strings
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size_t getStringsArgumentPosition()
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{
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return 1;
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}
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/// Called for each next string.
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void set(Pos pos_, Pos end_)
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{
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pos = pos_;
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end = end_;
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}
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/// Get the next token, if any, or return false.
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bool get(Pos & token_begin, Pos & token_end)
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{
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if (sep.empty())
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{
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if (pos == end)
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return false;
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token_begin = pos;
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pos += 1;
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token_end = pos;
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}
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else
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{
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if (!pos)
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return false;
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token_begin = pos;
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pos = reinterpret_cast<Pos>(memmem(pos, end - pos, sep.data(), sep.size()));
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if (pos)
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{
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token_end = pos;
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pos += sep.size();
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}
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else
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token_end = end;
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}
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return true;
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}
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};
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class ExtractAllImpl
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{
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private:
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Regexps::Pool::Pointer re;
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OptimizedRegularExpression::MatchVec matches;
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size_t capture;
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Pos pos;
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Pos end;
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public:
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static constexpr auto name = "extractAll";
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static String getName() { return name; }
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static size_t getNumberOfArguments() { return 2; }
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/// Check the type of function arguments.
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static void checkArguments(const DataTypes & arguments)
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{
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SplitByStringImpl::checkArguments(arguments);
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}
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/// Initialize by the function arguments.
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void init(Block & block, const ColumnNumbers & arguments)
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{
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const ColumnConst * col = checkAndGetColumnConstStringOrFixedString(block.getByPosition(arguments[1]).column.get());
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if (!col)
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throw Exception("Illegal column " + block.getByPosition(arguments[1]).column->getName()
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+ " of first argument of function " + getName() + ". Must be constant string.",
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ErrorCodes::ILLEGAL_COLUMN);
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re = Regexps::get<false, false>(col->getValue<String>());
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capture = re->getNumberOfSubpatterns() > 0 ? 1 : 0;
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matches.resize(capture + 1);
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}
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/// Returns the position of the argument that is the column of strings
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size_t getStringsArgumentPosition()
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{
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return 0;
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}
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/// Called for each next string.
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void set(Pos pos_, Pos end_)
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{
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pos = pos_;
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end = end_;
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}
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/// Get the next token, if any, or return false.
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bool get(Pos & token_begin, Pos & token_end)
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{
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if (!pos || pos > end)
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return false;
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if (!re->match(pos, end - pos, matches) || !matches[0].length)
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return false;
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if (matches[capture].offset == std::string::npos)
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{
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/// Empty match.
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token_begin = pos;
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token_end = pos;
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}
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else
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{
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token_begin = pos + matches[capture].offset;
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token_end = token_begin + matches[capture].length;
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}
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pos += matches[0].offset + matches[0].length;
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return true;
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}
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};
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/// A function that takes a string, and returns an array of substrings created by some generator.
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template <typename Generator>
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class FunctionTokens : public IFunction
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{
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public:
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static constexpr auto name = Generator::name;
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static FunctionPtr create(const Context &) { return std::make_shared<FunctionTokens>(); }
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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 Generator::getNumberOfArguments(); }
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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Generator::checkArguments(arguments);
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return std::make_shared<DataTypeArray>(std::make_shared<DataTypeString>());
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}
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/) override
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{
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Generator generator;
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generator.init(block, arguments);
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size_t array_argument_position = arguments[generator.getStringsArgumentPosition()];
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const ColumnString * col_str = checkAndGetColumn<ColumnString>(block.getByPosition(array_argument_position).column.get());
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const ColumnConst * col_const_str =
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checkAndGetColumnConstStringOrFixedString(block.getByPosition(array_argument_position).column.get());
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auto col_res = ColumnArray::create(ColumnString::create());
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ColumnString & res_strings = typeid_cast<ColumnString &>(col_res->getData());
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ColumnArray::Offsets & res_offsets = col_res->getOffsets();
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ColumnString::Chars & res_strings_chars = res_strings.getChars();
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ColumnString::Offsets & res_strings_offsets = res_strings.getOffsets();
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if (col_str)
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{
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const ColumnString::Chars & src_chars = col_str->getChars();
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const ColumnString::Offsets & src_offsets = col_str->getOffsets();
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res_offsets.reserve(src_offsets.size());
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res_strings_offsets.reserve(src_offsets.size() * 5); /// Constant 5 - at random.
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res_strings_chars.reserve(src_chars.size());
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Pos token_begin = nullptr;
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Pos token_end = nullptr;
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size_t size = src_offsets.size();
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ColumnString::Offset current_src_offset = 0;
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ColumnArray::Offset current_dst_offset = 0;
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ColumnString::Offset current_dst_strings_offset = 0;
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for (size_t i = 0; i < size; ++i)
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{
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Pos pos = reinterpret_cast<Pos>(&src_chars[current_src_offset]);
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current_src_offset = src_offsets[i];
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Pos end = reinterpret_cast<Pos>(&src_chars[current_src_offset]) - 1;
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generator.set(pos, end);
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size_t j = 0;
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while (generator.get(token_begin, token_end))
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{
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size_t token_size = token_end - token_begin;
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res_strings_chars.resize(res_strings_chars.size() + token_size + 1);
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memcpySmallAllowReadWriteOverflow15(&res_strings_chars[current_dst_strings_offset], token_begin, token_size);
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res_strings_chars[current_dst_strings_offset + token_size] = 0;
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current_dst_strings_offset += token_size + 1;
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res_strings_offsets.push_back(current_dst_strings_offset);
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++j;
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}
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current_dst_offset += j;
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res_offsets.push_back(current_dst_offset);
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}
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block.getByPosition(result).column = std::move(col_res);
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}
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else if (col_const_str)
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{
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String src = col_const_str->getValue<String>();
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Array dst;
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generator.set(src.data(), src.data() + src.size());
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Pos token_begin = nullptr;
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Pos token_end = nullptr;
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while (generator.get(token_begin, token_end))
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dst.push_back(String(token_begin, token_end - token_begin));
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block.getByPosition(result).column = block.getByPosition(result).type->createColumnConst(col_const_str->size(), dst);
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}
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else
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throw Exception("Illegal columns " + block.getByPosition(array_argument_position).column->getName()
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+ ", " + block.getByPosition(array_argument_position).column->getName()
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+ " of arguments of function " + getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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};
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/// Joins an array of strings into one string via a separator.
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class FunctionArrayStringConcat : public IFunction
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{
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private:
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void executeInternal(
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const ColumnString::Chars & src_chars,
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const ColumnString::Offsets & src_string_offsets,
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const ColumnArray::Offsets & src_array_offsets,
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const char * delimiter, const size_t delimiter_size,
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ColumnString::Chars & dst_chars,
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ColumnString::Offsets & dst_string_offsets)
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{
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size_t size = src_array_offsets.size();
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if (!size)
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return;
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/// With a small margin - as if the separator goes after the last string of the array.
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dst_chars.resize(
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src_chars.size()
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+ delimiter_size * src_string_offsets.size() /// Separators after each string...
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+ src_array_offsets.size() /// Zero byte after each joined string
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- src_string_offsets.size()); /// The former zero byte after each string of the array
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/// There will be as many strings as there were arrays.
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dst_string_offsets.resize(src_array_offsets.size());
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ColumnArray::Offset current_src_array_offset = 0;
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ColumnString::Offset current_src_string_offset = 0;
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ColumnString::Offset current_dst_string_offset = 0;
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/// Loop through the array of strings.
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for (size_t i = 0; i < size; ++i)
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{
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/// Loop through the rows within the array. /// NOTE You can do everything in one copy, if the separator has a size of 1.
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for (auto next_src_array_offset = src_array_offsets[i]; current_src_array_offset < next_src_array_offset; ++current_src_array_offset)
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{
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size_t bytes_to_copy = src_string_offsets[current_src_array_offset] - current_src_string_offset - 1;
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memcpySmallAllowReadWriteOverflow15(
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&dst_chars[current_dst_string_offset], &src_chars[current_src_string_offset], bytes_to_copy);
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current_src_string_offset = src_string_offsets[current_src_array_offset];
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current_dst_string_offset += bytes_to_copy;
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if (current_src_array_offset + 1 != next_src_array_offset)
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{
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memcpy(&dst_chars[current_dst_string_offset], delimiter, delimiter_size);
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current_dst_string_offset += delimiter_size;
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}
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}
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dst_chars[current_dst_string_offset] = 0;
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++current_dst_string_offset;
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dst_string_offsets[i] = current_dst_string_offset;
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}
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dst_chars.resize(dst_string_offsets.back());
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}
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public:
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static constexpr auto name = "arrayStringConcat";
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static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayStringConcat>(); }
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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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bool isVariadic() const override { return true; }
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size_t getNumberOfArguments() const override { return 0; }
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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if (arguments.size() != 1 && arguments.size() != 2)
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throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
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+ toString(arguments.size()) + ", should be 1 or 2.",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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const DataTypeArray * array_type = checkAndGetDataType<DataTypeArray>(arguments[0].get());
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if (!array_type || !isString(array_type->getNestedType()))
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throw Exception("First argument for function " + getName() + " must be array of strings.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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if (arguments.size() == 2
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&& !isString(arguments[1]))
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throw Exception("Second argument for function " + getName() + " must be constant string.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return std::make_shared<DataTypeString>();
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}
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/) override
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{
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String delimiter;
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if (arguments.size() == 2)
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{
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const ColumnConst * col_delim = checkAndGetColumnConstStringOrFixedString(block.getByPosition(arguments[1]).column.get());
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|
if (!col_delim)
|
|
throw Exception("Second argument for function " + getName() + " must be constant string.", ErrorCodes::ILLEGAL_COLUMN);
|
|
|
|
delimiter = col_delim->getValue<String>();
|
|
}
|
|
|
|
if (const ColumnConst * col_const_arr = checkAndGetColumnConst<ColumnArray>(block.getByPosition(arguments[0]).column.get()))
|
|
{
|
|
Array src_arr = col_const_arr->getValue<Array>();
|
|
String dst_str;
|
|
for (size_t i = 0, size = src_arr.size(); i < size; ++i)
|
|
{
|
|
if (i != 0)
|
|
dst_str += delimiter;
|
|
dst_str += src_arr[i].get<const String &>();
|
|
}
|
|
|
|
block.getByPosition(result).column = block.getByPosition(result).type->createColumnConst(col_const_arr->size(), dst_str);
|
|
}
|
|
else
|
|
{
|
|
const ColumnArray & col_arr = assert_cast<const ColumnArray &>(*block.getByPosition(arguments[0]).column);
|
|
const ColumnString & col_string = assert_cast<const ColumnString &>(col_arr.getData());
|
|
|
|
auto col_res = ColumnString::create();
|
|
|
|
executeInternal(
|
|
col_string.getChars(), col_string.getOffsets(), col_arr.getOffsets(),
|
|
delimiter.data(), delimiter.size(),
|
|
col_res->getChars(), col_res->getOffsets());
|
|
|
|
block.getByPosition(result).column = std::move(col_res);
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
using FunctionAlphaTokens = FunctionTokens<AlphaTokensImpl>;
|
|
using FunctionSplitByChar = FunctionTokens<SplitByCharImpl>;
|
|
using FunctionSplitByString = FunctionTokens<SplitByStringImpl>;
|
|
using FunctionExtractAll = FunctionTokens<ExtractAllImpl>;
|
|
|
|
}
|