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#include <Parsers/ASTIdentifier_fwd.h>
#include <Parsers/ASTLiteral.h>
#include <Parsers/ASTShowTablesQuery.h>
#include <Parsers/CommonParsers.h>
#include <Parsers/ParserShowTablesQuery.h>
#include <Parsers/ExpressionElementParsers.h>
#include <Parsers/ExpressionListParsers.h>
#include <Parsers/parseIdentifierOrStringLiteral.h>
#include <Common/typeid_cast.h>
namespace DB
{
bool ParserShowTablesQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
{
ParserKeyword s_show("SHOW");
ParserKeyword s_full("FULL");
ParserKeyword s_temporary("TEMPORARY");
ParserKeyword s_tables("TABLES");
ParserKeyword s_databases("DATABASES");
ParserKeyword s_clusters("CLUSTERS");
ParserKeyword s_cluster("CLUSTER");
ParserKeyword s_dictionaries("DICTIONARIES");
ParserKeyword s_caches("FILESYSTEM CACHES");
ParserKeyword s_settings("SETTINGS");
ParserKeyword s_changed("CHANGED");
ParserKeyword s_from("FROM");
ParserKeyword s_in("IN");
ParserKeyword s_not("NOT");
ParserKeyword s_like("LIKE");
ParserKeyword s_ilike("ILIKE");
ParserKeyword s_where("WHERE");
ParserKeyword s_limit("LIMIT");
ParserStringLiteral like_p;
ParserIdentifier name_p(true);
ParserExpressionWithOptionalAlias exp_elem(false);
ASTPtr like;
ASTPtr database;
auto query = std::make_shared<ASTShowTablesQuery>();
if (!s_show.ignore(pos, expected))
return false;
if (s_full.ignore(pos, expected))
{
query->full = true;
}
if (s_databases.ignore(pos, expected))
{
query->databases = true;
if (s_not.ignore(pos, expected))
query->not_like = true;
if (bool insensitive = s_ilike.ignore(pos, expected); insensitive || s_like.ignore(pos, expected))
{
if (insensitive)
query->case_insensitive_like = true;
if (!like_p.parse(pos, like, expected))
return false;
}
else if (query->not_like)
return false;
if (s_limit.ignore(pos, expected))
{
if (!exp_elem.parse(pos, query->limit_length, expected))
return false;
}
}
else if (s_clusters.ignore(pos, expected))
{
query->clusters = true;
if (s_not.ignore(pos, expected))
query->not_like = true;
if (bool insensitive = s_ilike.ignore(pos, expected); insensitive || s_like.ignore(pos, expected))
{
if (insensitive)
query->case_insensitive_like = true;
if (!like_p.parse(pos, like, expected))
return false;
}
else if (query->not_like)
return false;
if (s_limit.ignore(pos, expected))
{
if (!exp_elem.parse(pos, query->limit_length, expected))
return false;
}
}
else if (s_caches.ignore(pos, expected))
{
query->caches = true;
}
else if (s_cluster.ignore(pos, expected))
{
query->cluster = true;
String cluster_str;
if (!parseIdentifierOrStringLiteral(pos, expected, cluster_str))
return false;
query->cluster_str = std::move(cluster_str);
}
else if (bool changed = s_changed.ignore(pos, expected); changed || s_settings.ignore(pos, expected))
{
query->m_settings = true;
if (changed)
{
query->changed = true;
if (!s_settings.ignore(pos, expected))
return false;
}
/// Not expected due to "SHOW SETTINGS PROFILES"
if (bool insensitive = s_ilike.ignore(pos, expected); insensitive || s_like.ignore(pos, expected))
{
if (insensitive)
query->case_insensitive_like = true;
if (!like_p.parse(pos, like, expected))
return false;
}
else
return false;
}
else
{
if (s_temporary.ignore(pos))
query->temporary = true;
if (!s_tables.ignore(pos, expected))
{
if (s_dictionaries.ignore(pos, expected))
query->dictionaries = true;
else
return false;
}
if (s_from.ignore(pos, expected) || s_in.ignore(pos, expected))
if (!name_p.parse(pos, database, expected))
return false;
if (s_not.ignore(pos, expected))
query->not_like = true;
if (bool insensitive = s_ilike.ignore(pos, expected); insensitive || s_like.ignore(pos, expected))
{
if (insensitive)
query->case_insensitive_like = true;
if (!like_p.parse(pos, like, expected))
return false;
}
else if (query->not_like)
return false;
else if (s_where.ignore(pos, expected))
if (!exp_elem.parse(pos, query->where_expression, expected))
return false;
if (s_limit.ignore(pos, expected))
if (!exp_elem.parse(pos, query->limit_length, expected))
return false;
}
query->set(query->from, database);
if (like)
query->like = like->as<ASTLiteral &>().value.safeGet<const String &>();
node = query;
return true;
}
}
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