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68 lines
1.7 KiB
C++
68 lines
1.7 KiB
C++
#include <Interpreters/RewriteCountVariantsVisitor.h>
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#include <Parsers/ASTFunction.h>
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#include <Parsers/ASTLiteral.h>
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#include <Parsers/ASTSubquery.h>
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#include <Parsers/ASTTablesInSelectQuery.h>
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#include <Poco/String.h>
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#include <Common/typeid_cast.h>
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#include <Common/checkStackSize.h>
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#include <Interpreters/Context.h>
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namespace DB
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{
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void RewriteCountVariantsVisitor::visit(ASTPtr & node)
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{
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checkStackSize();
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if (node->as<ASTSubquery>() || node->as<ASTTableExpression>() || node->as<ASTArrayJoin>())
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return;
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for (auto & child : node->children)
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visit(child);
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if (auto * func = node->as<ASTFunction>())
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visit(*func);
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}
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void RewriteCountVariantsVisitor::visit(ASTFunction & func)
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{
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if (!func.arguments || func.arguments->children.empty() || func.arguments->children.size() > 1 || !func.arguments->children[0])
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return;
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auto name = Poco::toLower(func.name);
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if (name != "sum" && name != "count")
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return;
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auto & func_arguments = func.arguments->children;
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const auto * first_arg_literal = func_arguments[0]->as<ASTLiteral>();
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if (!first_arg_literal)
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return;
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bool transform = false;
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if (name == "count")
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{
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if (first_arg_literal->value.getType() != Field::Types::Null)
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transform = true;
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}
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else if (name == "sum")
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{
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if (first_arg_literal->value.getType() == Field::Types::UInt64)
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{
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auto constant = first_arg_literal->value.get<UInt64>();
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if (constant == 1 && !context->getSettingsRef().aggregate_functions_null_for_empty)
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transform = true;
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}
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}
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if (!transform)
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return;
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func.name = "count";
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func.arguments->children.clear();
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}
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}
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