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79 lines
2.9 KiB
C++
79 lines
2.9 KiB
C++
#include <AggregateFunctions/parseAggregateFunctionParameters.h>
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#include <Parsers/ExpressionListParsers.h>
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#include <Parsers/parseQuery.h>
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#include <Common/typeid_cast.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int BAD_ARGUMENTS;
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extern const int PARAMETERS_TO_AGGREGATE_FUNCTIONS_MUST_BE_LITERALS;
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}
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Array getAggregateFunctionParametersArray(const ASTPtr & expression_list, const std::string & error_context)
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{
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const ASTs & parameters = typeid_cast<const ASTExpressionList &>(*expression_list).children;
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if (parameters.empty())
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throw Exception("Parameters list to aggregate functions cannot be empty", ErrorCodes::BAD_ARGUMENTS);
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Array params_row(parameters.size());
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for (size_t i = 0; i < parameters.size(); ++i)
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{
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const ASTLiteral * lit = typeid_cast<const ASTLiteral *>(parameters[i].get());
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if (!lit)
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{
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throw Exception("Parameters to aggregate functions must be literals" + (error_context.empty() ? "" : " (in " + error_context +")"),
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ErrorCodes::PARAMETERS_TO_AGGREGATE_FUNCTIONS_MUST_BE_LITERALS);
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}
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params_row[i] = lit->value;
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}
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return params_row;
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}
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void getAggregateFunctionNameAndParametersArray(
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const std::string & aggregate_function_name_with_params,
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std::string & aggregate_function_name,
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Array & aggregate_function_parameters,
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const std::string & error_context)
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{
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if (aggregate_function_name_with_params.back() != ')')
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{
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aggregate_function_name = aggregate_function_name_with_params;
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aggregate_function_parameters = Array();
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return;
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}
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size_t pos = aggregate_function_name_with_params.find('(');
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if (pos == std::string::npos || pos + 2 >= aggregate_function_name_with_params.size())
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throw Exception(aggregate_function_name_with_params + " doesn't look like aggregate function name in " + error_context + ".",
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ErrorCodes::BAD_ARGUMENTS);
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aggregate_function_name = aggregate_function_name_with_params.substr(0, pos);
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std::string parameters_str = aggregate_function_name_with_params.substr(pos + 1, aggregate_function_name_with_params.size() - pos - 2);
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if (aggregate_function_name.empty())
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throw Exception(aggregate_function_name_with_params + " doesn't look like aggregate function name in " + error_context + ".",
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ErrorCodes::BAD_ARGUMENTS);
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ParserExpressionList params_parser(false);
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ASTPtr args_ast = parseQuery(params_parser,
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parameters_str.data(), parameters_str.data() + parameters_str.size(),
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"parameters of aggregate function in " + error_context);
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ASTExpressionList & args_list = typeid_cast<ASTExpressionList &>(*args_ast);
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if (args_list.children.empty())
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throw Exception("Incorrect list of parameters to aggregate function "
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+ aggregate_function_name, ErrorCodes::BAD_ARGUMENTS);
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aggregate_function_parameters = getAggregateFunctionParametersArray(args_ast);
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}
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}
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