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#include <Parsers/FunctionParameterValuesVisitor.h>
#include <Parsers/ASTExpressionList.h>
#include <Parsers/ASTFunction.h>
#include <Parsers/ASTIdentifier.h>
#include <Parsers/ASTLiteral.h>
#include <Parsers/parseQuery.h>
#include <Common/FieldVisitorToString.h>
#include <Parsers/ASTHelpers.h>
#include <Common/assert_cast.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
}
class FunctionParameterValuesVisitor
{
public:
explicit FunctionParameterValuesVisitor(NameToNameMap & parameter_values_)
: parameter_values(parameter_values_)
{
}
void visit(const ASTPtr & ast)
{
if (const auto * function = ast->as<ASTFunction>())
visitFunction(*function);
for (const auto & child : ast->children)
visit(child);
}
private:
NameToNameMap & parameter_values;
void visitFunction(const ASTFunction & parameter_function)
{
if (parameter_function.name != "equals" && parameter_function.children.size() != 1)
return;
const auto * expression_list = parameter_function.children[0]->as<ASTExpressionList>();
if (expression_list && expression_list->children.size() != 2)
return;
if (const auto * identifier = expression_list->children[0]->as<ASTIdentifier>())
{
if (const auto * literal = expression_list->children[1]->as<ASTLiteral>())
{
parameter_values[identifier->name()] = convertFieldToString(literal->value);
}
else if (const auto * function = expression_list->children[1]->as<ASTFunction>())
{
if (isFunctionCast(function))
{
const auto * cast_expression = assert_cast<ASTExpressionList*>(function->arguments.get());
if (cast_expression->children.size() != 2)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Function CAST must have exactly two arguments");
if (const auto * cast_literal = cast_expression->children[0]->as<ASTLiteral>())
{
parameter_values[identifier->name()] = convertFieldToString(cast_literal->value);
}
}
}
}
}
};
NameToNameMap analyzeFunctionParamValues(const ASTPtr & ast)
{
NameToNameMap parameter_values;
FunctionParameterValuesVisitor(parameter_values).visit(ast);
return parameter_values;
}
}
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