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dbms: function 'transform': development [#METR-15987].

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This commit is contained in:
Alexey Milovidov 2015-04-28 08:21:41 +03:00
parent d371b7c843
commit 738e736500
3 changed files with 102 additions and 51 deletions
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120
dbms/include/DB/Functions/FunctionsMiscellaneous.h
View File

@ -1000,31 +1000,23 @@ public:
if (!array_from && !array_to)
throw Exception("Second and third arguments of function " + getName() + " must be constant arrays.", ErrorCodes::ILLEGAL_COLUMN);
prepare(array_from->getData(), array_to->getData());
/// Задано ли значение по-умолчанию.
Field default_value;
if (arguments.size() == 4)
{
const IColumnConst * default_col = dynamic_cast<const IColumnConst *>(&*block.getByPosition(arguments[3]).column);
default_value = (*default_col)[0];
}
prepare(array_from->getData(), array_to->getData(), block, arguments);
const auto in = block.getByPosition(arguments.front()).column.get();
auto column_result = block.getByPosition(result).type->createColumn();
auto out = column_result.get();
if (!executeNum<UInt8>(in, out, default_value)
&& !executeNum<UInt16>(in, out, default_value)
&& !executeNum<UInt32>(in, out, default_value)
&& !executeNum<UInt64>(in, out, default_value)
&& !executeNum<Int8>(in, out, default_value)
&& !executeNum<Int16>(in, out, default_value)
&& !executeNum<Int32>(in, out, default_value)
&& !executeNum<Int64>(in, out, default_value)
&& !executeNum<Float32>(in, out, default_value)
&& !executeNum<Float64>(in, out, default_value)
&& !executeString(in, out, default_value))
if (!executeNum<UInt8>(in, out)
&& !executeNum<UInt16>(in, out)
&& !executeNum<UInt32>(in, out)
&& !executeNum<UInt64>(in, out)
&& !executeNum<Int8>(in, out)
&& !executeNum<Int16>(in, out)
&& !executeNum<Int32>(in, out)
&& !executeNum<Int64>(in, out)
&& !executeNum<Float32>(in, out)
&& !executeNum<Float64>(in, out)
&& !executeString(in, out))
throw Exception(
"Illegal column " + in->getName() + " of first argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN);
@ -1033,7 +1025,7 @@ public:
}
template <typename T>
bool executeNum(const IColumn * in_untyped, IColumn * out_untyped, const Field & default_value)
bool executeNum(const IColumn * in_untyped, IColumn * out_untyped)
{
if (const auto in = typeid_cast<const ColumnVector<T> *>(in_untyped))
{
@ -1050,17 +1042,17 @@ public:
}
else
{
if (!executeNumToNumWithDefault<T, UInt8>(in, out_untyped, default_value)
&& !executeNumToNumWithDefault<T, UInt16>(in, out_untyped, default_value)
&& !executeNumToNumWithDefault<T, UInt32>(in, out_untyped, default_value)
&& !executeNumToNumWithDefault<T, UInt64>(in, out_untyped, default_value)
&& !executeNumToNumWithDefault<T, Int8>(in, out_untyped, default_value)
&& !executeNumToNumWithDefault<T, Int16>(in, out_untyped, default_value)
&& !executeNumToNumWithDefault<T, Int32>(in, out_untyped, default_value)
&& !executeNumToNumWithDefault<T, Int64>(in, out_untyped, default_value)
&& !executeNumToNumWithDefault<T, Float32>(in, out_untyped, default_value)
&& !executeNumToNumWithDefault<T, Float64>(in, out_untyped, default_value)
&& !executeNumToString<T>(in, out_untyped, default_value))
if (!executeNumToNumWithDefault<T, UInt8>(in, out_untyped)
&& !executeNumToNumWithDefault<T, UInt16>(in, out_untyped)
&& !executeNumToNumWithDefault<T, UInt32>(in, out_untyped)
&& !executeNumToNumWithDefault<T, UInt64>(in, out_untyped)
&& !executeNumToNumWithDefault<T, Int8>(in, out_untyped)
&& !executeNumToNumWithDefault<T, Int16>(in, out_untyped)
&& !executeNumToNumWithDefault<T, Int32>(in, out_untyped)
&& !executeNumToNumWithDefault<T, Int64>(in, out_untyped)
&& !executeNumToNumWithDefault<T, Float32>(in, out_untyped)
&& !executeNumToNumWithDefault<T, Float64>(in, out_untyped)
&& !executeNumToString<T>(in, out_untyped))
throw Exception(
"Illegal column " + in->getName() + " of elements of array of second argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN);
@ -1078,21 +1070,21 @@ public:
return false;
}
bool executeString(const IColumn * in_untyped, IColumn * out_untyped, const Field & default_value)
bool executeString(const IColumn * in_untyped, IColumn * out_untyped)
{
if (const auto in = typeid_cast<const ColumnString *>(in_untyped))
{
if (!executeStringToNum<UInt8>(in, out_untyped, default_value)
&& !executeStringToNum<UInt16>(in, out_untyped, default_value)
&& !executeStringToNum<UInt32>(in, out_untyped, default_value)
&& !executeStringToNum<UInt64>(in, out_untyped, default_value)
&& !executeStringToNum<Int8>(in, out_untyped, default_value)
&& !executeStringToNum<Int16>(in, out_untyped, default_value)
&& !executeStringToNum<Int32>(in, out_untyped, default_value)
&& !executeStringToNum<Int64>(in, out_untyped, default_value)
&& !executeStringToNum<Float32>(in, out_untyped, default_value)
&& !executeStringToNum<Float64>(in, out_untyped, default_value)
&& !executeStringToString(in, out_untyped, default_value))
if (!executeStringToNum<UInt8>(in, out_untyped)
&& !executeStringToNum<UInt16>(in, out_untyped)
&& !executeStringToNum<UInt32>(in, out_untyped)
&& !executeStringToNum<UInt64>(in, out_untyped)
&& !executeStringToNum<Int8>(in, out_untyped)
&& !executeStringToNum<Int16>(in, out_untyped)
&& !executeStringToNum<Int32>(in, out_untyped)
&& !executeStringToNum<Int64>(in, out_untyped)
&& !executeStringToNum<Float32>(in, out_untyped)
&& !executeStringToNum<Float64>(in, out_untyped)
&& !executeStringToString(in, out_untyped))
throw Exception(
"Illegal column " + in->getName() + " of elements of array of second argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN);
@ -1110,7 +1102,7 @@ public:
}
template <typename T, typename U>
bool executeNumToNumWithDefault(const ColumnVector<T> * in, IColumn * out_untyped, const Field & default_value)
bool executeNumToNumWithDefault(const ColumnVector<T> * in, IColumn * out_untyped)
{
auto out = typeid_cast<ColumnVector<U> *>(out_untyped);
if (!out)
@ -1121,7 +1113,7 @@ public:
}
template <typename T>
bool executeNumToString(const ColumnVector<T> * in, IColumn * out_untyped, const Field & default_value)
bool executeNumToString(const ColumnVector<T> * in, IColumn * out_untyped)
{
auto out = typeid_cast<ColumnString *>(out_untyped);
if (!out)
@ -1134,7 +1126,7 @@ public:
}
template <typename U>
bool executeStringToNum(const ColumnString * in, IColumn * out_untyped, const Field & default_value)
bool executeStringToNum(const ColumnString * in, IColumn * out_untyped)
{
auto out = typeid_cast<ColumnVector<U> *>(out_untyped);
if (!out)
@ -1144,7 +1136,7 @@ public:
return true;
}
bool executeStringToString(const ColumnString * in, IColumn * out_untyped, const Field & default_value)
bool executeStringToString(const ColumnString * in, IColumn * out_untyped)
{
auto out = typeid_cast<ColumnString *>(out_untyped);
if (!out)
@ -1275,11 +1267,13 @@ private:
Arena string_pool;
Field default_value; /// Null, если не задано.
bool prepared = false;
std::mutex mutex;
/// Может вызываться из разных потоков. Срабатывает только при первом вызове.
void prepare(const Array & from, const Array & to)
void prepare(const Array & from, const Array & to, Block & block, const ColumnNumbers & arguments)
{
if (prepared)
return;
@ -1296,6 +1290,30 @@ private:
if (from.size() != to.size())
throw Exception("Second and third arguments of function " + getName() + " must be arrays of same size", ErrorCodes::BAD_ARGUMENTS);
Array converted_to;
const Array * used_to = &to;
/// Задано ли значение по-умолчанию.
if (arguments.size() == 4)
{
const IColumnConst * default_col = dynamic_cast<const IColumnConst *>(&*block.getByPosition(arguments[3]).column);
default_value = (*default_col)[0];
/// Нужно ли преобразовать элементы to и default_value к наименьшему общему типу, который является Float64?
if (default_value.getType() == Field::Types::Float64 && to[0].getType() != Field::Types::Float64)
{
converted_to.resize(to.size());
for (size_t i = 0, size = to.size(); i < size; ++i)
converted_to[i] = apply_visitor(FieldVisitorConvertToNumber<Float64>(), to[i]);
used_to = &converted_to;
}
else if (default_value.getType() != Field::Types::Float64 && to[0].getType() == Field::Types::Float64)
{
default_value = apply_visitor(FieldVisitorConvertToNumber<Float64>(), default_value);
}
}
/// Замечание: не делается проверка дубликатов в массиве from.
if (from[0].getType() != Field::Types::String && to[0].getType() != Field::Types::String)
@ -1303,7 +1321,7 @@ private:
table_num_to_num.reset(new NumToNum);
auto & table = *table_num_to_num;
for (size_t i = 0; i < size; ++i)
table[from[i].get<UInt64>()] = to[i].get<UInt64>();
table[from[i].get<UInt64>()] = (*used_to)[i].get<UInt64>();
}
else if (from[0].getType() != Field::Types::String && to[0].getType() == Field::Types::String)
{
@ -1324,7 +1342,7 @@ private:
{
const String & str_from = from[i].get<const String &>();
StringRef ref{string_pool.insert(str_from.data(), str_from.size() + 1), str_from.size() + 1};
table[ref] = to[i].get<UInt64>();
table[ref] = (*used_to)[i].get<UInt64>();
}
}
else if (from[0].getType() == Field::Types::String && to[0].getType() == Field::Types::String)

30
dbms/tests/queries/0_stateless/00153_transform.reference
View File

@ -68,3 +68,33 @@ abc
333
0
0
-1
-1
-1
111
-1
222
-1
333
-1
-1
-1.1
-1.1
-1.1
111
-1.1
222
-1.1
333
-1.1
-1.1
1
1
1
111
1
222.2
1
333
1
1

3
dbms/tests/queries/0_stateless/00153_transform.sql
View File

@ -5,3 +5,6 @@ SELECT transform(toString(number), ['3', '5', '7'], ['hello', 'world', 'abc']) F
SELECT transform(toString(number), ['3', '5', '7'], ['hello', 'world', 'abc'], '') FROM system.numbers LIMIT 10;
SELECT transform(toString(number), ['3', '5', '7'], ['hello', 'world', 'abc'], '-') FROM system.numbers LIMIT 10;
SELECT transform(toString(number), ['3', '5', '7'], [111, 222, 333], 0) FROM system.numbers LIMIT 10;
SELECT transform(toString(number), ['3', '5', '7'], [111, 222, 333], -1) FROM system.numbers LIMIT 10;
SELECT transform(toString(number), ['3', '5', '7'], [111, 222, 333], -1.1) FROM system.numbers LIMIT 10;
SELECT transform(toString(number), ['3', '5', '7'], [111, 222.2, 333], 1) FROM system.numbers LIMIT 10;