Use WriteByte for single byte operations (#5167)

Co-authored-by: Mikhail Faraponov <mikefaraponov@Mikhails-MacBook-Pro.local>

clause/limit.go

@@ -21,7 +21,7 @@ func (limit Limit) Build(builder Builder) {
 	}
 	if limit.Offset > 0 {
 		if limit.Limit > 0 {
-			builder.WriteString(" ")
+			builder.WriteByte(' ')
 		}
 		builder.WriteString("OFFSET ")
 		builder.WriteString(strconv.Itoa(limit.Offset))

clause/where.go

@@ -72,9 +72,9 @@ func buildExprs(exprs []Expression, builder Builder, joinCond string) {
 		}
 
 		if wrapInParentheses {
-			builder.WriteString(`(`)
+			builder.WriteByte('(')
 			expr.Build(builder)
-			builder.WriteString(`)`)
+			builder.WriteByte(')')
 			wrapInParentheses = false
 		} else {
 			expr.Build(builder)