c0ba7040d5
Use uninitialized<expression> for that. Since it's heavily used, alias it as "uexpression". To prevent uninitialized<> from leaking into the rest of the system, change do_with_parser() to unwrap it. We add an unwrap_uninitialized_t template type alias for that. Lots of std::move()s are sprinkled around to make things compile, as uninitialized<T> refuses to convert to T without them.
98 lines
4.0 KiB
C++
98 lines
4.0 KiB
C++
/*
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* Copyright (C) 2016-present ScyllaDB
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*
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* Modified by ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include <vector>
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#include <boost/algorithm/string/join.hpp>
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#include <boost/range/adaptor/transformed.hpp>
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#include <seastar/core/sstring.hh>
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#include "cql3/column_identifier.hh"
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#include "cql3/CqlParser.hpp"
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#include "cql3/error_collector.hh"
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#include "cql3/statements/raw/select_statement.hh"
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namespace cql3 {
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namespace util {
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void do_with_parser_impl(const sstring_view& cql, noncopyable_function<void (cql3_parser::CqlParser& p)> func);
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template <typename Func, typename Result = cql3_parser::unwrap_uninitialized_t<std::result_of_t<Func(cql3_parser::CqlParser&)>>>
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Result do_with_parser(const sstring_view& cql, Func&& f) {
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std::optional<Result> ret;
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do_with_parser_impl(cql, [&] (cql3_parser::CqlParser& parser) {
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ret.emplace(f(parser));
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});
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return std::move(*ret);
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}
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sstring relations_to_where_clause(const expr::expression& e);
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expr::expression where_clause_to_relations(const sstring_view& where_clause);
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sstring rename_column_in_where_clause(const sstring_view& where_clause, column_identifier::raw from, column_identifier::raw to);
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/// build a CQL "select" statement with the desired parameters.
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/// If select_all_columns==true, all columns are selected and the value of
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/// selected_columns is ignored.
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std::unique_ptr<cql3::statements::raw::select_statement> build_select_statement(
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const sstring_view& cf_name,
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const sstring_view& where_clause,
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bool select_all_columns,
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const std::vector<column_definition>& selected_columns);
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/// maybe_quote() takes an identifier - the name of a column, table or
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/// keyspace name - and transforms it to a string which can be used in CQL
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/// commands. Namely, if the identifier is not entirely lower-case (including
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/// digits and underscores), it needs to be quoted to be represented in CQL.
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/// Without this quoting, CQL folds uppercase letters to lower case, and
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/// forbids non-alpha-numeric characters in identifier names.
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/// Quoting involves wrapping the string in double-quotes ("). A double-quote
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/// character itself is quoted by doubling it.
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/// maybe_quote() also quotes reserved CQL keywords (e.g., "to", "where")
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/// but doesn't quote *unreserved* keywords (like ttl, int or as).
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/// Note that this means that if new reserved keywords are added to the
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/// parser, a saved output of maybe_quote() may no longer be parsable by
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/// parser. To avoid this forward-compatibility issue, use quote() instead
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/// of maybe_quote() - to unconditionally quote an identifier even if it is
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/// lowercase and not (yet) a keyword.
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sstring maybe_quote(const sstring& s);
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/// quote() takes an identifier - the name of a column, table or keyspace -
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/// and transforms it to a string which can be safely used in CQL commands.
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/// Quoting involves wrapping the name in double-quotes ("). A double-quote
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/// character itself is quoted by doubling it.
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/// Quoting is necessary when the identifier contains non-alpha-numeric
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/// characters, when it contains uppercase letters (which will be folded to
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/// lowercase if not quoted), or when the identifier is one of many CQL
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/// keywords. But it's allowed - and easier - to just unconditionally
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/// quote the identifier name in CQL, so that is what this function does does.
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sstring quote(const sstring& s);
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/// single_quote() takes a string and transforms it to a string
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/// which can be safely used in CQL commands.
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/// Single quoting involves wrapping the name in single-quotes ('). A sigle-quote
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/// character itself is quoted by doubling it.
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/// Single quoting is necessary for dates, IP addresses or string literals.
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sstring single_quote(const sstring& s);
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// Check whether timestamp is not too far in the future as this probably
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// indicates its incorrectness (for example using other units than microseconds).
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void validate_timestamp(const db::config& config, const query_options& options, const std::unique_ptr<attributes>& attrs);
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} // namespace util
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} // namespace cql3
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