blob: 106b62a9c9ff09969e49756bc4cd187e81bd7253 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
#pragma once
#include "FunctionArrayMapped.h"
namespace DB
{
/** arrayMap(x1, ..., xn -> expression, array1, ..., arrayn) - apply the expression to each element of the array (or set of parallel arrays).
*/
struct ArrayMapImpl
{
/// true if the expression (for an overload of f(expression, arrays)) or an array (for f(array)) should be boolean.
static bool needBoolean() { return false; }
/// true if the f(array) overload is unavailable.
static bool needExpression() { return true; }
/// true if the array must be exactly one.
static bool needOneArray() { return false; }
static DataTypePtr getReturnType(const DataTypePtr & expression_return, const DataTypePtr & /*array_element*/)
{
return std::make_shared<DataTypeArray>(expression_return);
}
static ColumnPtr execute(const ColumnArray & array, ColumnPtr mapped)
{
return ColumnArray::create(mapped->convertToFullColumnIfConst(), array.getOffsetsPtr());
}
};
struct NameArrayMap { static constexpr auto name = "arrayMap"; };
using FunctionArrayMap = FunctionArrayMapped<ArrayMapImpl, NameArrayMap>;
}
|
