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https://github.com/ClickHouse/ClickHouse.git
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100 lines
3.4 KiB
C++
100 lines
3.4 KiB
C++
#include <TableFunctions/TableFunctionFactory.h>
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#include <Interpreters/parseColumnsListForTableFunction.h>
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#include <Parsers/ASTFunction.h>
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#include <Parsers/ASTLiteral.h>
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#include <Common/Exception.h>
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#include <Storages/StorageInput.h>
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#include <Storages/checkAndGetLiteralArgument.h>
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#include <DataTypes/DataTypeFactory.h>
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#include <Interpreters/evaluateConstantExpression.h>
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#include "registerTableFunctions.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 LOGICAL_ERROR;
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extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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extern const int CANNOT_EXTRACT_TABLE_STRUCTURE;
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}
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namespace
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{
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/* input(structure) - allows to make INSERT SELECT from incoming stream of data
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*/
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class TableFunctionInput : public ITableFunction
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{
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public:
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static constexpr auto name = "input";
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std::string getName() const override { return name; }
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bool hasStaticStructure() const override { return true; }
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bool needStructureHint() const override { return true; }
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void setStructureHint(const ColumnsDescription & structure_hint_) override { structure_hint = structure_hint_; }
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private:
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StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns, bool is_insert_query) const override;
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const char * getStorageTypeName() const override { return "Input"; }
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ColumnsDescription getActualTableStructure(ContextPtr context, bool is_insert_query) const override;
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void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
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String structure;
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ColumnsDescription structure_hint;
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};
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void TableFunctionInput::parseArguments(const ASTPtr & ast_function, ContextPtr context)
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{
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const auto * function = ast_function->as<ASTFunction>();
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if (!function->arguments)
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throw Exception(ErrorCodes::LOGICAL_ERROR, "Table function '{}' must have arguments", getName());
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auto args = function->arguments->children;
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if (args.empty())
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{
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structure = "auto";
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return;
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}
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if (args.size() != 1)
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throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
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"Table function '{}' requires exactly 1 argument: structure", getName());
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structure = checkAndGetLiteralArgument<String>(evaluateConstantExpressionOrIdentifierAsLiteral(args[0], context), "structure");
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}
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ColumnsDescription TableFunctionInput::getActualTableStructure(ContextPtr context, bool /*is_insert_query*/) const
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{
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if (structure == "auto")
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{
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if (structure_hint.empty())
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throw Exception(
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ErrorCodes::CANNOT_EXTRACT_TABLE_STRUCTURE,
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"Table function '{}' was used without structure argument but structure could not be determined automatically. Please, "
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"provide structure manually",
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getName());
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return structure_hint;
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}
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return parseColumnsListFromString(structure, context);
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}
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StoragePtr TableFunctionInput::executeImpl(const ASTPtr & /*ast_function*/, ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/, bool is_insert_query) const
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{
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auto storage = std::make_shared<StorageInput>(StorageID(getDatabaseName(), table_name), getActualTableStructure(context, is_insert_query));
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storage->startup();
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return storage;
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}
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}
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void registerTableFunctionInput(TableFunctionFactory & factory)
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{
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factory.registerFunction<TableFunctionInput>();
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}
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}
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