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LibSQL: Parse common-table-expressions with a nested SELECT statement

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This also moves testing of common-table-expression to its own test case.
This commit is contained in:
Timothy Flynn 2021-04-23 14:45:56 -04:00 • committed by Andreas Kling
parent cb943a2179
commit 004025c3c4
3 changed files with 71 additions and 54 deletions
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116
Userland/Libraries/LibSQL/Tests/TestSqlStatementParser.cpp
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@ -56,7 +56,6 @@ TEST_CASE(create_table)
EXPECT(parse("CREATE TABLE test ( column1 varchar(.abc) )").is_error());
EXPECT(parse("CREATE TABLE test ( column1 varchar(0x) )").is_error());
EXPECT(parse("CREATE TABLE test ( column1 varchar(0xzzz) )").is_error());
EXPECT(parse("WITH table AS () CREATE TABLE test ( column1 );").is_error());
EXPECT(parse("CREATE TABLE test ( column1 int ) AS SELECT * FROM table;").is_error());
EXPECT(parse("CREATE TABLE test AS SELECT * FROM table ( column1 int ) ;").is_error());
@ -132,7 +131,6 @@ TEST_CASE(drop_table)
EXPECT(parse("DROP TABLE").is_error());
EXPECT(parse("DROP TABLE test").is_error());
EXPECT(parse("DROP TABLE IF test;").is_error());
EXPECT(parse("WITH table AS () DROP TABLE test;").is_error());
auto validate = [](StringView sql, StringView expected_schema, StringView expected_table, bool expected_is_error_if_table_does_not_exist = true) {
auto result = parse(sql);
@ -164,23 +162,8 @@ TEST_CASE(delete_)
EXPECT(parse("DELETE FROM table WHERE 15 RETURNING column").is_error());
EXPECT(parse("DELETE FROM table WHERE 15 RETURNING column AS;").is_error());
EXPECT(parse("DELETE FROM table WHERE (');").is_error());
EXPECT(parse("WITH DELETE FROM table;").is_error());
EXPECT(parse("WITH table DELETE FROM table;").is_error());
EXPECT(parse("WITH table AS DELETE FROM table;").is_error());
EXPECT(parse("WITH RECURSIVE table DELETE FROM table;").is_error());
EXPECT(parse("WITH RECURSIVE table AS DELETE FROM table;").is_error());
struct SelectedTableList {
struct SelectedTable {
StringView table_name {};
Vector<StringView> column_names {};
};
bool recursive { false };
Vector<SelectedTable> selected_tables {};
};
auto validate = [](StringView sql, SelectedTableList expected_selected_tables, StringView expected_schema, StringView expected_table, StringView expected_alias, bool expect_where_clause, bool expect_returning_clause, Vector<StringView> expected_returned_column_aliases) {
auto validate = [](StringView sql, StringView expected_schema, StringView expected_table, StringView expected_alias, bool expect_where_clause, bool expect_returning_clause, Vector<StringView> expected_returned_column_aliases) {
auto result = parse(sql);
EXPECT(!result.is_error());
@ -189,25 +172,6 @@ TEST_CASE(delete_)
const auto& delete_ = static_cast<const SQL::Delete&>(*statement);
const auto& common_table_expression_list = delete_.common_table_expression_list();
EXPECT_EQ(common_table_expression_list.is_null(), expected_selected_tables.selected_tables.is_empty());
if (common_table_expression_list) {
EXPECT_EQ(common_table_expression_list->recursive(), expected_selected_tables.recursive);
const auto& common_table_expressions = common_table_expression_list->common_table_expressions();
EXPECT_EQ(common_table_expressions.size(), expected_selected_tables.selected_tables.size());
for (size_t i = 0; i < common_table_expressions.size(); ++i) {
const auto& common_table_expression = common_table_expressions[i];
const auto& expected_common_table_expression = expected_selected_tables.selected_tables[i];
EXPECT_EQ(common_table_expression.table_name(), expected_common_table_expression.table_name);
EXPECT_EQ(common_table_expression.column_names().size(), expected_common_table_expression.column_names.size());
for (size_t j = 0; j < common_table_expression.column_names().size(); ++j)
EXPECT_EQ(common_table_expression.column_names()[j], expected_common_table_expression.column_names[j]);
}
}
const auto& qualified_table_name = delete_.qualified_table_name();
EXPECT_EQ(qualified_table_name->schema_name(), expected_schema);
EXPECT_EQ(qualified_table_name->table_name(), expected_table);
@ -233,20 +197,14 @@ TEST_CASE(delete_)
}
};
validate("DELETE FROM table;", {}, {}, "table", {}, false, false, {});
validate("DELETE FROM schema.table;", {}, "schema", "table", {}, false, false, {});
validate("DELETE FROM schema.table AS alias;", {}, "schema", "table", "alias", false, false, {});
validate("DELETE FROM table WHERE (1 == 1);", {}, {}, "table", {}, true, false, {});
validate("DELETE FROM table RETURNING *;", {}, {}, "table", {}, false, true, {});
validate("DELETE FROM table RETURNING column;", {}, {}, "table", {}, false, true, { {} });
validate("DELETE FROM table RETURNING column AS alias;", {}, {}, "table", {}, false, true, { "alias" });
validate("DELETE FROM table RETURNING column1 AS alias1, column2 AS alias2;", {}, {}, "table", {}, false, true, { "alias1", "alias2" });
// FIXME: When parsing of SELECT statements are supported, the common-table-expressions below will become invalid due to the empty "AS ()" clause.
validate("WITH table AS () DELETE FROM table;", { false, { { "table" } } }, {}, "table", {}, false, false, {});
validate("WITH table (column) AS () DELETE FROM table;", { false, { { "table", { "column" } } } }, {}, "table", {}, false, false, {});
validate("WITH table (column1, column2) AS () DELETE FROM table;", { false, { { "table", { "column1", "column2" } } } }, {}, "table", {}, false, false, {});
validate("WITH RECURSIVE table AS () DELETE FROM table;", { true, { { "table", {} } } }, {}, "table", {}, false, false, {});
validate("DELETE FROM table;", {}, "table", {}, false, false, {});
validate("DELETE FROM schema.table;", "schema", "table", {}, false, false, {});
validate("DELETE FROM schema.table AS alias;", "schema", "table", "alias", false, false, {});
validate("DELETE FROM table WHERE (1 == 1);", {}, "table", {}, true, false, {});
validate("DELETE FROM table RETURNING *;", {}, "table", {}, false, true, {});
validate("DELETE FROM table RETURNING column;", {}, "table", {}, false, true, { {} });
validate("DELETE FROM table RETURNING column AS alias;", {}, "table", {}, false, true, { "alias" });
validate("DELETE FROM table RETURNING column1 AS alias1, column2 AS alias2;", {}, "table", {}, false, true, { "alias1", "alias2" });
}
TEST_CASE(select)
@ -415,4 +373,60 @@ TEST_CASE(select)
validate("SELECT * FROM table LIMIT 15 OFFSET 16;", all, from, false, 0, false, {}, true, true);
}
TEST_CASE(common_table_expression)
{
EXPECT(parse("WITH DELETE FROM table;").is_error());
EXPECT(parse("WITH table DELETE FROM table;").is_error());
EXPECT(parse("WITH table AS DELETE FROM table;").is_error());
EXPECT(parse("WITH RECURSIVE table DELETE FROM table;").is_error());
EXPECT(parse("WITH RECURSIVE table AS DELETE FROM table;").is_error());
// Below are otherwise valid common-table-expressions, but attached to statements which do not allow them.
EXPECT(parse("WITH table AS (SELECT * AS TABLE) CREATE TABLE test ( column1 );").is_error());
EXPECT(parse("WITH table AS (SELECT * FROM table) DROP TABLE test;").is_error());
struct SelectedTableList {
struct SelectedTable {
StringView table_name {};
Vector<StringView> column_names {};
};
bool recursive { false };
Vector<SelectedTable> selected_tables {};
};
auto validate = [](StringView sql, SelectedTableList expected_selected_tables) {
auto result = parse(sql);
EXPECT(!result.is_error());
auto statement = result.release_value();
EXPECT(is<SQL::Delete>(*statement));
const auto& delete_ = static_cast<const SQL::Delete&>(*statement);
const auto& common_table_expression_list = delete_.common_table_expression_list();
EXPECT(!common_table_expression_list.is_null());
EXPECT_EQ(common_table_expression_list->recursive(), expected_selected_tables.recursive);
const auto& common_table_expressions = common_table_expression_list->common_table_expressions();
EXPECT_EQ(common_table_expressions.size(), expected_selected_tables.selected_tables.size());
for (size_t i = 0; i < common_table_expressions.size(); ++i) {
const auto& common_table_expression = common_table_expressions[i];
const auto& expected_common_table_expression = expected_selected_tables.selected_tables[i];
EXPECT_EQ(common_table_expression.table_name(), expected_common_table_expression.table_name);
EXPECT_EQ(common_table_expression.column_names().size(), expected_common_table_expression.column_names.size());
for (size_t j = 0; j < common_table_expression.column_names().size(); ++j)
EXPECT_EQ(common_table_expression.column_names()[j], expected_common_table_expression.column_names[j]);
}
};
validate("WITH table AS (SELECT * FROM table) DELETE FROM table;", { false, { { "table" } } });
validate("WITH table (column) AS (SELECT * FROM table) DELETE FROM table;", { false, { { "table", { "column" } } } });
validate("WITH table (column1, column2) AS (SELECT * FROM table) DELETE FROM table;", { false, { { "table", { "column1", "column2" } } } });
validate("WITH RECURSIVE table AS (SELECT * FROM table) DELETE FROM table;", { true, { { "table", {} } } });
}
TEST_MAIN(SqlStatementParser)