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119 lines
3.8 KiB
C++
119 lines
3.8 KiB
C++
#include <Columns/IColumn.h>
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#include <DataTypes/DataTypeFactory.h>
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#include <DataTypes/IDataType.h>
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#include <Formats/FormatSettings.h>
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#include <IO/ReadBufferFromString.h>
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#include <Interpreters/IdentifierSemantic.h>
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#include <Interpreters/ReplaceQueryParameterVisitor.h>
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#include <Interpreters/addTypeConversionToAST.h>
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#include <Parsers/ASTIdentifier.h>
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#include <Parsers/ASTLiteral.h>
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#include <Parsers/ASTQueryParameter.h>
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#include <Parsers/TablePropertiesQueriesASTs.h>
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#include <Common/quoteString.h>
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#include <Common/typeid_cast.h>
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#include <Common/checkStackSize.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 UNKNOWN_QUERY_PARAMETER;
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extern const int BAD_QUERY_PARAMETER;
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}
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void ReplaceQueryParameterVisitor::visit(ASTPtr & ast)
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{
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checkStackSize();
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if (ast->as<ASTQueryParameter>())
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visitQueryParameter(ast);
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else if (ast->as<ASTIdentifier>() || ast->as<ASTTableIdentifier>())
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visitIdentifier(ast);
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else
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{
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if (auto * describe_query = dynamic_cast<ASTDescribeQuery *>(ast.get()); describe_query && describe_query->table_expression)
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visitChildren(describe_query->table_expression);
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else
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visitChildren(ast);
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}
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}
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void ReplaceQueryParameterVisitor::visitChildren(ASTPtr & ast)
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{
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for (auto & child : ast->children)
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visit(child);
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}
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const String & ReplaceQueryParameterVisitor::getParamValue(const String & name)
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{
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auto search = query_parameters.find(name);
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if (search != query_parameters.end())
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return search->second;
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else
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throw Exception("Substitution " + backQuote(name) + " is not set", ErrorCodes::UNKNOWN_QUERY_PARAMETER);
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}
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void ReplaceQueryParameterVisitor::visitQueryParameter(ASTPtr & ast)
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{
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const auto & ast_param = ast->as<ASTQueryParameter &>();
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const String & value = getParamValue(ast_param.name);
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const String & type_name = ast_param.type;
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String alias = ast_param.alias;
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const auto data_type = DataTypeFactory::instance().get(type_name);
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auto temp_column_ptr = data_type->createColumn();
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IColumn & temp_column = *temp_column_ptr;
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ReadBufferFromString read_buffer{value};
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FormatSettings format_settings;
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data_type->getDefaultSerialization()->deserializeTextEscaped(temp_column, read_buffer, format_settings);
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if (!read_buffer.eof())
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throw Exception(ErrorCodes::BAD_QUERY_PARAMETER,
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"Value {} cannot be parsed as {} for query parameter '{}'"
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" because it isn't parsed completely: only {} of {} bytes was parsed: {}",
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value, type_name, ast_param.name, read_buffer.count(), value.size(), value.substr(0, read_buffer.count()));
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Field literal;
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/// If data type has custom serialization, we should use CAST from String,
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/// because CAST from field may not work correctly (for example for type IPv6).
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if (data_type->getCustomSerialization())
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literal = value;
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else
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literal = temp_column[0];
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ast = addTypeConversionToAST(std::make_shared<ASTLiteral>(literal), type_name);
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/// Keep the original alias.
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ast->setAlias(alias);
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}
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void ReplaceQueryParameterVisitor::visitIdentifier(ASTPtr & ast)
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{
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auto ast_identifier = dynamic_pointer_cast<ASTIdentifier>(ast);
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if (ast_identifier->children.empty())
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return;
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auto & name_parts = ast_identifier->name_parts;
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for (size_t i = 0, j = 0, size = name_parts.size(); i < size; ++i)
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{
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if (name_parts[i].empty())
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{
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const auto & ast_param = ast_identifier->children[j++]->as<ASTQueryParameter &>();
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name_parts[i] = getParamValue(ast_param.name);
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}
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}
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/// FIXME: what should this mean?
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if (!ast_identifier->semantic->special && name_parts.size() >= 2)
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ast_identifier->semantic->table = ast_identifier->name_parts.end()[-2];
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ast_identifier->resetFullName();
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ast_identifier->children.clear();
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}
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}
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