blob: 6f9cfe482f1caff9bf60f13a6984388ea4469e4d (
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
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
#include <Analyzer/Passes/IfConstantConditionPass.h>
#include <Functions/FunctionFactory.h>
#include <Analyzer/InDepthQueryTreeVisitor.h>
#include <Analyzer/ConstantNode.h>
#include <Analyzer/FunctionNode.h>
namespace DB
{
namespace
{
class IfConstantConditionVisitor : public InDepthQueryTreeVisitor<IfConstantConditionVisitor>
{
public:
static void visitImpl(QueryTreeNodePtr & node)
{
auto * function_node = node->as<FunctionNode>();
if (!function_node || (function_node->getFunctionName() != "if" && function_node->getFunctionName() != "multiIf"))
return;
if (function_node->getArguments().getNodes().size() != 3)
return;
auto & first_argument = function_node->getArguments().getNodes()[0];
const auto * first_argument_constant_node = first_argument->as<ConstantNode>();
if (!first_argument_constant_node)
return;
const auto & condition_value = first_argument_constant_node->getValue();
bool condition_boolean_value = false;
if (condition_value.getType() == Field::Types::Int64)
condition_boolean_value = static_cast<bool>(condition_value.safeGet<Int64>());
else if (condition_value.getType() == Field::Types::UInt64)
condition_boolean_value = static_cast<bool>(condition_value.safeGet<UInt64>());
else
return;
if (condition_boolean_value)
node = function_node->getArguments().getNodes()[1];
else
node = function_node->getArguments().getNodes()[2];
}
};
}
void IfConstantConditionPass::run(QueryTreeNodePtr query_tree_node, ContextPtr)
{
IfConstantConditionVisitor visitor;
visitor.visit(query_tree_node);
}
}
|
