Fix Precedence rule for Tilda op (#16649)

Signed-off-by: Manan Gupta <manan@planetscale.com>
Signed-off-by: Andres Taylor <andres@planetscale.com>
Co-authored-by: Andres Taylor <andres@planetscale.com>

go/vt/sqlparser/normalizer_test.go

@@ -405,6 +405,13 @@ func TestNormalize(t *testing.T) {
 			"bv2": sqltypes.Int64BindVariable(2),
 			"bv3": sqltypes.TestBindVariable([]any{1, 2}),
 		},
+	}, {
+		in:      "SELECT 1 WHERE (~ (1||0)) IS NULL",
+		outstmt: "select :bv1 /* INT64 */ from dual where ~(:bv1 /* INT64 */ or :bv2 /* INT64 */) is null",
+		outbv: map[string]*querypb.BindVariable{
+			"bv1": sqltypes.Int64BindVariable(1),
+			"bv2": sqltypes.Int64BindVariable(0),
+		},
 	}}
 	for _, tc := range testcases {
 		t.Run(tc.in, func(t *testing.T) {
@@ -491,6 +498,7 @@ func TestNormalizeOneCasae(t *testing.T) {
 	err = Normalize(tree, NewReservedVars("vtg", known), bv)
 	require.NoError(t, err)
 	normalizerOutput := String(tree)
+	require.EqualValues(t, testOne.output, normalizerOutput)
 	if normalizerOutput == "otheradmin" || normalizerOutput == "otherread" {
 		return
 	}

go/vt/sqlparser/precedence.go

@@ -38,7 +38,6 @@ const (
 	P14
 	P15
 	P16
-	P17
 )
 
 // precedenceFor returns the precedence of an expression.
@@ -80,7 +79,7 @@ func precedenceFor(in Expr) Precendence {
 		switch node.Operator {
 		case UPlusOp, UMinusOp:
 			return P4
-		case BangOp:
+		default:
 			return P3
 		}
 	}

go/vt/sqlparser/precedence_test.go

@@ -156,6 +156,7 @@ func TestParens(t *testing.T) {
 		{in: "(10 - 2) - 1", expected: "10 - 2 - 1"},
 		{in: "10 - (2 - 1)", expected: "10 - (2 - 1)"},
 		{in: "0 <=> (1 and 0)", expected: "0 <=> (1 and 0)"},
+		{in: "(~ (1||0)) IS NULL", expected: "~(1 or 0) is null"},
 		{in: "1 not like ('a' is null)", expected: "1 not like ('a' is null)"},
 		{in: ":vtg1 not like (:vtg2 is null)", expected: ":vtg1 not like (:vtg2 is null)"},
 	}