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LibSQL: Implement a DESCRIBE TABLE statement
This statement (for now) outputs the name and types of the different attributes in a table. It's not standard SQL but all DBMSs that I know of implement a sort of statement for such functionality. Since the output of DESCRIBE TABLE is just a relation, an internal schema, `master` was created and a table definition for DESCRIBE into it. The table definition and the master schema are not accessible by the user.
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@ -1,5 +1,6 @@
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/*
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* Copyright (c) 2021, Tim Flynn <trflynn89@serenityos.org>
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* Copyright (c) 2021, Mahmoud Mandour <ma.mandourr@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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@ -1050,4 +1051,18 @@ private:
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RefPtr<LimitClause> m_limit_clause;
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};
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class DescribeTable : public Statement {
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public:
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DescribeTable(NonnullRefPtr<QualifiedTableName> qualified_table_name)
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: m_qualified_table_name(move(qualified_table_name))
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{
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}
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NonnullRefPtr<QualifiedTableName> qualified_table_name() const { return m_qualified_table_name; }
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RefPtr<SQLResult> execute(ExecutionContext&) const override;
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private:
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NonnullRefPtr<QualifiedTableName> m_qualified_table_name;
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};
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}
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