test(sql): cover seedOrdersWithOrphan
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@@ -310,3 +310,166 @@ class DiskExecutorTest {
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run("INSERT INTO orders VALUES (1, 1, 100), (2, 1, 50), (3, 2, 200)")
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run("INSERT INTO orders VALUES (1, 1, 100), (2, 1, 50), (3, 2, 200)")
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}
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}
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// Adds an order referencing a customer id that does not exist, so RIGHT/FULL JOIN has an
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// unmatched *right* row to pad with NULLs on top of grace's unmatched left row from seedOrders.
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private fun Database.seedOrdersWithOrphan() {
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seedOrders()
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run("INSERT INTO orders VALUES (4, 99, 999)")
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}
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@Test
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fun rightJoinPadsUnmatchedRightRowsWithNulls() {
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val db = newDatabase()
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db.seedOrdersWithOrphan()
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val result = db.select(
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"SELECT customers.name, orders.amount FROM customers RIGHT JOIN orders ON customers.id = orders.customer_id ORDER BY orders.id"
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)
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assertEquals(
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listOf(
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listOf(text("ada"), int(100)),
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listOf(text("ada"), int(50)),
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listOf(text("linus"), int(200)),
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listOf(Value.NullValue, int(999))
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),
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result.rows
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)
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}
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@Test
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fun fullJoinKeepsBothUnmatchedLeftAndRightRows() {
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val db = newDatabase()
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db.seedOrdersWithOrphan()
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val result = db.select(
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"SELECT customers.name, orders.amount FROM customers FULL JOIN orders ON customers.id = orders.customer_id"
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)
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assertEquals(
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setOf(
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listOf(text("ada"), int(100)),
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listOf(text("ada"), int(50)),
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listOf(text("linus"), int(200)),
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listOf(text("grace"), Value.NullValue),
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listOf(Value.NullValue, int(999))
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),
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result.rows.toSet()
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)
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assertEquals(5, result.rows.size)
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}
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@Test
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fun crossJoinProducesTheFullCartesianProductWithNoOnClause() {
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val db = newDatabase()
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db.run("CREATE TABLE colors (name TEXT)")
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db.run("CREATE TABLE sizes (label TEXT)")
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db.run("INSERT INTO colors VALUES ('red'), ('blue')")
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db.run("INSERT INTO sizes VALUES ('s'), ('m')")
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val result = db.select("SELECT colors.name, sizes.label FROM colors CROSS JOIN sizes ORDER BY colors.name, sizes.label")
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assertEquals(
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listOf(
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listOf(text("blue"), text("m")), listOf(text("blue"), text("s")),
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listOf(text("red"), text("m")), listOf(text("red"), text("s"))
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),
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result.rows
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)
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}
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@Test
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fun rightOuterAndFullOuterJoinSpellingsAreAccepted() {
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val db = newDatabase()
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db.seedOrders()
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val right = db.select(
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"SELECT customers.name FROM customers RIGHT OUTER JOIN orders ON customers.id = orders.customer_id ORDER BY orders.id"
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)
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assertEquals(listOf(listOf(text("ada")), listOf(text("ada")), listOf(text("linus"))), right.rows)
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val full = db.select(
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"SELECT customers.name FROM customers FULL OUTER JOIN orders ON customers.id = orders.customer_id ORDER BY customers.id"
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)
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assertEquals(4, full.rows.size)
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}
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@Test
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fun innerJoinCombinesMatchingRowsAndDropsUnmatchedLeftRows() {
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val db = newDatabase()
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db.seedOrders()
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val result = db.select(
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"SELECT customers.name, orders.amount FROM customers JOIN orders ON customers.id = orders.customer_id ORDER BY orders.id"
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)
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assertEquals(listOf("name", "amount"), result.columns)
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assertEquals(
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listOf(listOf(text("ada"), int(100)), listOf(text("ada"), int(50)), listOf(text("linus"), int(200))),
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result.rows
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)
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}
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@Test
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fun leftJoinPadsUnmatchedLeftRowsWithNulls() {
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val db = newDatabase()
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db.seedOrders()
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val result = db.select(
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"SELECT customers.name, orders.amount FROM customers LEFT JOIN orders ON customers.id = orders.customer_id ORDER BY customers.id, orders.id"
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)
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assertEquals(
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listOf(
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listOf(text("ada"), int(100)),
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listOf(text("ada"), int(50)),
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listOf(text("linus"), int(200)),
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listOf(text("grace"), Value.NullValue)
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),
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result.rows
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)
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}
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@Test
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fun joinUsesTableAliasesToQualifyColumnsWithTheSameName() {
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val db = newDatabase()
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db.run("CREATE TABLE a (id INTEGER PRIMARY KEY, tag TEXT NOT NULL)")
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db.run("CREATE TABLE b (id INTEGER PRIMARY KEY, tag TEXT NOT NULL)")
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db.run("INSERT INTO a VALUES (1, 'left')")
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db.run("INSERT INTO b VALUES (1, 'right')")
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val result = db.select("SELECT x.tag, y.tag FROM a x JOIN b y ON x.id = y.id")
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assertEquals(listOf(listOf(text("left"), text("right"))), result.rows)
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}
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@Test
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fun anUnqualifiedColumnPresentInBothJoinedTablesIsRejectedAsAmbiguous() {
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val db = newDatabase()
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db.run("CREATE TABLE a (id INTEGER PRIMARY KEY)")
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db.run("CREATE TABLE b (id INTEGER PRIMARY KEY)")
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db.run("INSERT INTO a VALUES (1)")
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db.run("INSERT INTO b VALUES (1)")
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val failure = assertFailsWith<DiskExecutorException> { db.select("SELECT id FROM a JOIN b ON a.id = b.id") }
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assertTrue(failure.message!!.contains("ambiguous"))
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}
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@Test
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fun aDuplicateTableAliasAcrossJoinedSourcesIsRejected() {
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val db = newDatabase()
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db.run("CREATE TABLE a (id INTEGER PRIMARY KEY)")
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val failure = assertFailsWith<DiskExecutorException> { db.select("SELECT * FROM a x JOIN a x ON x.id = x.id") }
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assertTrue(failure.message!!.contains("duplicate table alias"))
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}
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@Test
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fun joiningThreeTablesChainsLeftToRight() {
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val db = newDatabase()
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db.seedOrders()
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db.run("CREATE TABLE shipments (id INTEGER PRIMARY KEY, order_id INTEGER NOT NULL, carrier TEXT NOT NULL)")
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db.run("INSERT INTO shipments VALUES (1, 1, 'ups')")
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val result = db.select(
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"SELECT customers.name, orders.amount, shipments.carrier " +
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"FROM customers JOIN orders ON customers.id = orders.customer_id " +
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"JOIN shipments ON orders.id = shipments.order_id"
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)
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assertEquals(listOf(listOf(text("ada"), int(100), text("ups"))), result.rows)
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}
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@Test
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fun joinAgainstADerivedTableWorks() {
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val db = newDatabase()
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db.run("CREATE TABLE a (id INTEGER PRIMARY KEY, name TEXT NOT NULL)")
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db.run("CREATE TABLE b (id INTEGER PRIMARY KEY)")
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db.run("INSERT INTO a VALUES (1, 'ada'), (2, 'linus')")
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db.run("INSERT INTO b VALUES (1)")
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val result = db.select("SELECT a.name FROM a JOIN (SELECT id FROM b) sub ON a.id = sub.id")
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assertEquals(listOf(listOf(text("ada"))), result.rows)
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}
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