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LibSQL: Do not crash when SELECTing from an empty table

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The crash was caused by getting the first element of an empty vector.
This commit is contained in:
Timothy Flynn 2022-02-09 17:10:08 -05:00 • committed by Linus Groh
parent 373b467302
commit f1f0770d68
2 changed files with 13 additions and 2 deletions
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11
Tests/LibSQL/TestSqlStatementExecution.cpp
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@ -177,6 +177,17 @@ TEST_CASE(insert_without_column_names)
EXPECT_EQ(rows_or_error.value().size(), 2u);
}
TEST_CASE(select_from_empty_table)
{
ScopeGuard guard([]() { unlink(db_name); });
auto database = SQL::Database::construct(db_name);
EXPECT(!database->open().is_error());
create_table(database);
auto result = execute(database, "SELECT * FROM TestSchema.TestTable;");
EXPECT(!result.is_error());
EXPECT(!result.has_results());
}
TEST_CASE(select_from_table)
{
ScopeGuard guard([]() { unlink(db_name); });

4
Userland/Libraries/LibSQL/AST/Select.cpp
View file

@ -69,8 +69,8 @@ Result Select::execute(ExecutionContext& context) const
auto old_descriptor_size = descriptor->size();
descriptor->extend(table_def->to_tuple_descriptor());
for (auto cartesian_row = rows.first(); cartesian_row.size() == old_descriptor_size; cartesian_row = rows.first()) {
rows.remove(0);
while (!rows.is_empty() && (rows.first().size() == old_descriptor_size)) {
auto cartesian_row = rows.take_first();
auto table_rows = TRY(context.database->select_all(*table_def));
for (auto& table_row : table_rows) {