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https://github.com/ClickHouse/ClickHouse.git
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66 lines
1.2 KiB
C++
66 lines
1.2 KiB
C++
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#include <DB/Parsers/ASTIdentifier.h>
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#include <DB/Parsers/ASTExistsQuery.h>
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#include <DB/Parsers/CommonParsers.h>
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#include <DB/Parsers/ParserExistsQuery.h>
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namespace DB
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{
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bool ParserExistsQuery::parseImpl(Pos & pos, Pos end, ASTPtr & node, String & expected)
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{
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Pos begin = pos;
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ParserWhiteSpaceOrComments ws;
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ParserString s_exists("EXISTS", true, true);
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ParserString s_table("TABLE", true, true);
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ParserString s_dot(".");
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ParserIdentifier name_p;
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ASTPtr database;
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ASTPtr table;
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ws.ignore(pos, end);
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if (!s_exists.ignore(pos, end, expected))
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return false;
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ws.ignore(pos, end);
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if (!s_table.ignore(pos, end, expected))
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return false;
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ws.ignore(pos, end);
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if (!name_p.parse(pos, end, table, expected))
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return false;
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ws.ignore(pos, end);
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if (s_dot.ignore(pos, end, expected))
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{
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database = table;
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if (!name_p.parse(pos, end, table, expected))
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return false;
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ws.ignore(pos, end);
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}
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ws.ignore(pos, end);
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ASTExistsQuery * query = new ASTExistsQuery(StringRange(begin, pos));
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node = query;
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if (database)
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query->database = dynamic_cast<ASTIdentifier &>(*database).name;
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if (table)
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query->table = dynamic_cast<ASTIdentifier &>(*table).name;
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return true;
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}
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}
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