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101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
#include <Interpreters/InterpreterShowIndexesQuery.h>
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#include <Common/quoteString.h>
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#include <IO/Operators.h>
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#include <IO/WriteBufferFromString.h>
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#include <Parsers/ASTShowIndexesQuery.h>
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#include <Parsers/formatAST.h>
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#include <Interpreters/Context.h>
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#include <Interpreters/executeQuery.h>
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namespace DB
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{
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InterpreterShowIndexesQuery::InterpreterShowIndexesQuery(const ASTPtr & query_ptr_, ContextMutablePtr context_)
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: WithMutableContext(context_)
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, query_ptr(query_ptr_)
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{
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}
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String InterpreterShowIndexesQuery::getRewrittenQuery()
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{
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const auto & query = query_ptr->as<ASTShowIndexesQuery &>();
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WriteBufferFromOwnString buf_table;
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writeEscapedString(query.table, buf_table);
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String table = buf_table.str();
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WriteBufferFromOwnString buf_database;
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String resolved_database = getContext()->resolveDatabase(query.database);
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writeEscapedString(resolved_database, buf_database);
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String database = buf_database.str();
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String where_expression = query.where_expression ? fmt::format("WHERE ({})", query.where_expression) : "";
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String rewritten_query = fmt::format(R"(
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SELECT *
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FROM (
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(SELECT
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name AS table,
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0 AS non_unique,
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'PRIMARY' AS key_name,
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NULL AS seq_in_index,
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NULL AS column_name,
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'A' AS collation,
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NULL AS cardinality,
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NULL AS sub_part,
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NULL AS packed,
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NULL AS null,
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'primary' AS index_type,
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NULL AS comment,
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NULL AS index_comment,
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'YES' AS visible,
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primary_key AS expression
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FROM system.tables
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WHERE
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database = '{0}'
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AND name = '{1}')
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UNION ALL (
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SELECT
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table AS table,
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0 AS non_unique,
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name AS key_name,
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NULL AS seq_in_index,
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NULL AS column_name,
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NULL AS collation,
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NULL AS cardinality,
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NULL AS sub_part,
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NULL AS packed,
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NULL AS null,
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type AS index_type,
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NULL AS comment,
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NULL AS index_comment,
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'YES' AS visible,
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expr AS expression
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FROM system.data_skipping_indices
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WHERE
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database = '{0}'
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AND table = '{1}'))
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{2}
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ORDER BY index_type, expression;)", database, table, where_expression);
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/// Sorting is strictly speaking not necessary but 1. it is convenient for users, 2. SQL currently does not allow to
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/// sort the output of SHOW INDEXES otherwise (SELECT * FROM (SHOW INDEXES ...) ORDER BY ...) is rejected) and 3. some
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/// SQL tests can take advantage of this.
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return rewritten_query;
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}
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BlockIO InterpreterShowIndexesQuery::execute()
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{
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return executeQuery(getRewrittenQuery(), getContext(), true);
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}
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}
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