Enable use of slices in tuples for HashLookups

Author: macneale4

enginetest/join_op_tests.go

@@ -123,6 +123,26 @@ var joinOpTests = []struct {
 			},
 		},
 	},
+	{
+		name: "left join on array data",
+		setup: [][]string{
+			{
+				"create table xy (x binary(2) primary key, y binary(2))",
+				"create table uv (u binary(2) primary key, v binary(2))",
+				"insert into xy values (x'F0F0',x'1234'),(x'2345',x'3456');",
+				"insert into uv values (x'fedc',x'F0F0');",
+			},
+		},
+		tests: []JoinOpTests{
+			{
+				Query: "select HEX(x),HEX(u) from xy left join uv on x = v OR y = u",
+				Expected: []sql.Row{
+					{"2345", nil},
+					{"F0F0", "FEDC"},
+				},
+			},
+		},
+	},
 	{
 		name: "point lookups",
 		setup: [][]string{

sql/plan/hash_lookup.go

@@ -132,22 +132,7 @@ func (n *HashLookup) GetHashKey(ctx *sql.Context, e sql.Expression, row sql.Row)
 		return nil, err
 	}
 	if s, ok := key.([]interface{}); ok {
-		switch len(s) {
-		case 0:
-			return [0]interface{}{}, nil
-		case 1:
-			return [1]interface{}{s[0]}, nil
-		case 2:
-			return [2]interface{}{s[0], s[1]}, nil
-		case 3:
-			return [3]interface{}{s[0], s[1], s[2]}, nil
-		case 4:
-			return [4]interface{}{s[0], s[1], s[2], s[3]}, nil
-		case 5:
-			return [5]interface{}{s[0], s[1], s[2], s[3], s[4]}, nil
-		default:
-			return sql.HashOf(s)
-		}
+		return sql.HashOf(s)
 	}
 	// byte slices are not hashable
 	if k, ok := key.([]byte); ok {