evalengine: Add handling for current timestamp functions

go/sqltypes/value.go

@@ -477,8 +477,7 @@ func (v Value) IsBinary() bool {
 
 // IsDateTime returns true if Value is datetime.
 func (v Value) IsDateTime() bool {
-	dt := int(querypb.Type_DATETIME)
-	return int(v.typ)&dt == dt
+	return v.typ == querypb.Type_DATETIME
 }
 
 // IsDecimal returns true if Value is a decimal.

go/vt/sqlparser/ast.go

@@ -2475,7 +2475,7 @@ type (
 	// supported functions are documented in the grammar
 	CurTimeFuncExpr struct {
 		Name IdentifierCI
-		Fsp  Expr // fractional seconds precision, integer from 0 to 6 or an Argument
+		Fsp  int // fractional seconds precision, integer from 0 to 6 or an Argument
 	}
 
 	// ExtractedSubquery is a subquery that has been extracted from the original AST

go/vt/sqlparser/ast_format.go

@@ -1486,8 +1486,8 @@ func (node *WeightStringFuncExpr) Format(buf *TrackedBuffer) {
 
 // Format formats the node.
 func (node *CurTimeFuncExpr) Format(buf *TrackedBuffer) {
-	if node.Fsp != nil {
-		buf.astPrintf(node, "%#s(%v)", node.Name.String(), node.Fsp)
+	if node.Fsp > 0 {
+		buf.astPrintf(node, "%#s(%d)", node.Name.String(), node.Fsp)
 	} else {
 		buf.astPrintf(node, "%#s()", node.Name.String())
 	}

go/vt/sqlparser/keywords.go

@@ -196,7 +196,9 @@ var keywords = []keyword{
 	{"csv", CSV},
 	{"current", CURRENT},
 	{"current_date", CURRENT_DATE},
+	{"curdate", CURDATE},
 	{"current_time", CURRENT_TIME},
+	{"curtime", CURTIME},
 	{"current_timestamp", CURRENT_TIMESTAMP},
 	{"current_user", CURRENT_USER},
 	{"cursor", UNUSED},
@@ -610,6 +612,7 @@ var keywords = []keyword{
 	{"st_polyfromtext", ST_PolygonFromText},
 	{"st_polygonfromtext", ST_PolygonFromText},
 	{"sum", SUM},
+	{"sysdate", SYSDATE},
 	{"system", UNUSED},
 	{"table", TABLE},
 	{"tables", TABLES},

go/vt/sqlparser/parse_test.go

@@ -810,7 +810,7 @@ var (
 	}, {
 		input: "select /* utc_timestamp as func */ utc_timestamp() from t",
 	}, {
-		input: "select /* utc_timestamp with fsp */ utc_timestamp(0) from t",
+		input: "select /* utc_timestamp with fsp */ utc_timestamp(1) from t",
 	}, {
 		input: "select /* utc_time */ utc_time() from t",
 	}, {
@@ -2792,7 +2792,7 @@ var (
 		output: "select json_array(BIN(11)) from dual",
 	}, {
 		input:  `SELECT JSON_ARRAY(1, "abc", NULL, TRUE, CURTIME());`,
-		output: `select json_array(1, 'abc', null, true, CURTIME()) from dual`,
+		output: `select json_array(1, 'abc', null, true, curtime()) from dual`,
 	}, {
 		input:  "SELECT JSON_OBJECT(1,2)",
 		output: "select json_object(1, 2) from dual",