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https://github.com/ClickHouse/ClickHouse.git
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140 lines
3.8 KiB
C++
140 lines
3.8 KiB
C++
#include <Parsers/ASTDropQuery.h>
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#include <Parsers/CommonParsers.h>
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#include <Parsers/ParserDropQuery.h>
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namespace DB
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{
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namespace
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{
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bool parseDropQuery(IParser::Pos & pos, ASTPtr & node, Expected & expected, const ASTDropQuery::Kind kind)
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{
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ParserKeyword s_temporary("TEMPORARY");
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ParserKeyword s_table("TABLE");
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ParserKeyword s_dictionary("DICTIONARY");
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ParserKeyword s_view("VIEW");
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ParserKeyword s_database("DATABASE");
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ParserToken s_dot(TokenType::Dot);
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ParserKeyword s_if_exists("IF EXISTS");
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ParserKeyword s_if_empty("IF EMPTY");
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ParserIdentifier name_p(true);
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ParserKeyword s_permanently("PERMANENTLY");
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ParserKeyword s_no_delay("NO DELAY");
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ParserKeyword s_sync("SYNC");
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ASTPtr database;
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ASTPtr table;
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String cluster_str;
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bool if_exists = false;
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bool if_empty = false;
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bool temporary = false;
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bool is_dictionary = false;
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bool is_view = false;
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bool sync = false;
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bool permanently = false;
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if (s_database.ignore(pos, expected))
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{
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if (s_if_exists.ignore(pos, expected))
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if_exists = true;
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if (s_if_empty.ignore(pos, expected))
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if_empty = true;
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if (!name_p.parse(pos, database, expected))
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return false;
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}
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else
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{
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if (s_view.ignore(pos, expected))
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is_view = true;
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else if (s_dictionary.ignore(pos, expected))
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is_dictionary = true;
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else if (s_temporary.ignore(pos, expected))
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temporary = true;
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/// for TRUNCATE queries TABLE keyword is assumed as default and can be skipped
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if (!is_view && !is_dictionary && (!s_table.ignore(pos, expected) && kind != ASTDropQuery::Kind::Truncate))
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{
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return false;
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}
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if (s_if_exists.ignore(pos, expected))
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if_exists = true;
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if (s_if_empty.ignore(pos, expected))
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if_empty = true;
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if (!name_p.parse(pos, table, expected))
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return false;
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if (s_dot.ignore(pos, expected))
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{
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database = table;
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if (!name_p.parse(pos, table, expected))
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return false;
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}
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}
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/// common for tables / dictionaries / databases
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if (ParserKeyword{"ON"}.ignore(pos, expected))
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{
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if (!ASTQueryWithOnCluster::parse(pos, cluster_str, expected))
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return false;
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}
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if (kind == ASTDropQuery::Kind::Detach && s_permanently.ignore(pos, expected))
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permanently = true;
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/// actually for TRUNCATE NO DELAY / SYNC means nothing
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if (s_no_delay.ignore(pos, expected) || s_sync.ignore(pos, expected))
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sync = true;
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auto query = std::make_shared<ASTDropQuery>();
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node = query;
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query->kind = kind;
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query->if_exists = if_exists;
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query->if_empty = if_empty;
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query->temporary = temporary;
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query->is_dictionary = is_dictionary;
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query->is_view = is_view;
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query->sync = sync;
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query->permanently = permanently;
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query->database = database;
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query->table = table;
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if (database)
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query->children.push_back(database);
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if (table)
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query->children.push_back(table);
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query->cluster = cluster_str;
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return true;
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}
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}
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bool ParserDropQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
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{
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ParserKeyword s_drop("DROP");
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ParserKeyword s_detach("DETACH");
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ParserKeyword s_truncate("TRUNCATE");
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if (s_drop.ignore(pos, expected))
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return parseDropQuery(pos, node, expected, ASTDropQuery::Kind::Drop);
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else if (s_detach.ignore(pos, expected))
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return parseDropQuery(pos, node, expected, ASTDropQuery::Kind::Detach);
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else if (s_truncate.ignore(pos, expected))
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return parseDropQuery(pos, node, expected, ASTDropQuery::Kind::Truncate);
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else
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return false;
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}
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}
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