fix: sql cast function when converting to float (#11817)

pkg/s3select/select_test.go

@@ -378,6 +378,31 @@ func TestJSONQueries(t *testing.T) {
 			query:      `SELECT date_diff(day, '2010-01-01T23:00:00Z', '2010-01-02T23:00:00Z') FROM S3Object LIMIT 1`,
 			wantResult: `{"_1":1}`,
 		},
+		{
+			name:       "cast_from_int_to_float",
+			query:      `SELECT cast(1 as float) FROM S3Object LIMIT 1`,
+			wantResult: `{"_1":1}`,
+		},
+		{
+			name:       "cast_from_float_to_float",
+			query:      `SELECT cast(1.0 as float) FROM S3Object LIMIT 1`,
+			wantResult: `{"_1":1}`,
+		},
+		{
+			name:       "arithmetic_integer_operand",
+			query:      `SELECT 1 / 2 FROM S3Object LIMIT 1`,
+			wantResult: `{"_1":0}`,
+		},
+		{
+			name:       "arithmetic_float_operand",
+			query:      `SELECT 1.0 / 2.0 * .3 FROM S3Object LIMIT 1`,
+			wantResult: `{"_1":0.15}`,
+		},
+		{
+			name:       "arithmetic_integer_float_operand",
+			query:      `SELECT 3.0 / 2, 5 / 2.0 FROM S3Object LIMIT 1`,
+			wantResult: `{"_1":1.5,"_2":2.5}`,
+		},
 	}
 
 	defRequest := `<?xml version="1.0" encoding="UTF-8"?>

pkg/s3select/sql/evaluate.go

@@ -476,8 +476,13 @@ func (e *FuncExpr) evalNode(r Record) (res *Value, err error) {
 // aggregation or a row function - it always returns a value.
 func (e *LitValue) evalNode(_ Record) (res *Value, err error) {
 	switch {
-	case e.Number != nil:
+	case e.Int != nil:
-		return floatToValue(*e.Number), nil
+		if *e.Int < math.MaxInt64 && *e.Int > math.MinInt64 {
+			return FromInt(int64(*e.Int)), nil
+		}
+		return FromFloat(*e.Int), nil
+	case e.Float != nil:
+		return FromFloat(*e.Float), nil
 	case e.String != nil:
 		return FromString(string(*e.String)), nil
 	case e.Boolean != nil:

pkg/s3select/sql/funceval.go

@@ -492,7 +492,7 @@ func floatCast(v *Value) (float64, error) {
 	switch x := v.value.(type) {
 	case float64:
 		return x, nil
-	case int:
+	case int64:
 		return float64(x), nil
 	case string:
 		f, err := strconv.ParseFloat(strings.TrimSpace(x), 64)

pkg/s3select/sql/parser.go

@@ -107,7 +107,7 @@ type TableExpression struct {
 // JSONPathElement represents a keypath component
 type JSONPathElement struct {
 	Key            *ObjectKey `parser:"  @@"`               // ['name'] and .name forms
-	Index          *int       `parser:"| \"[\" @Number \"]\""` // [3] form
+	Index          *int       `parser:"| \"[\" @Int \"]\""` // [3] form
 	ObjectWildcard bool       `parser:"| @\".*\""`          // .* form
 	ArrayWildcard  bool       `parser:"| @\"[*]\""`         // [*] form
 }
@@ -333,7 +333,8 @@ type DateDiffFunc struct {
 
 // LitValue represents a literal value parsed from the sql
 type LitValue struct {
-	Number  *float64       `parser:"(  @Number"`
+	Float   *float64       `parser:"(  @Float"`
+	Int     *float64       `parser:" | @Int"` // To avoid value out of range, use float64 instead
 	String  *LiteralString `parser:" | @LitString"`
 	Boolean *Boolean       `parser:" | @(\"TRUE\" | \"FALSE\")"`
 	Null    bool           `parser:" | @\"NULL\")"`
@@ -351,7 +352,8 @@ var (
 		`|(?P<Keyword>(?i)\b(?:SELECT|FROM|TOP|DISTINCT|ALL|WHERE|GROUP|BY|HAVING|UNION|MINUS|EXCEPT|INTERSECT|ORDER|LIMIT|OFFSET|TRUE|FALSE|NULL|IS|NOT|ANY|SOME|BETWEEN|AND|OR|LIKE|ESCAPE|AS|IN|BOOL|INT|INTEGER|STRING|FLOAT|DECIMAL|NUMERIC|TIMESTAMP|AVG|COUNT|MAX|MIN|SUM|COALESCE|NULLIF|CAST|DATE_ADD|DATE_DIFF|EXTRACT|TO_STRING|TO_TIMESTAMP|UTCNOW|CHAR_LENGTH|CHARACTER_LENGTH|LOWER|SUBSTRING|TRIM|UPPER|LEADING|TRAILING|BOTH|FOR)\b)` +
 		`|(?P<Ident>[a-zA-Z_][a-zA-Z0-9_]*)` +
 		`|(?P<QuotIdent>"([^"]*("")?)*")` +
-		`|(?P<Number>\d*\.?\d+([eE][-+]?\d+)?)` +
+		`|(?P<Float>\d*\.\d+([eE][-+]?\d+)?)` +
+		`|(?P<Int>\d+)` +
 		`|(?P<LitString>'([^']*('')?)*')` +
 		`|(?P<Operators><>|!=|<=|>=|\.\*|\[\*\]|[-+*/%,.()=<>\[\]])`,
 	))

pkg/s3select/sql/statement.go

@@ -127,10 +127,10 @@ func parseLimit(v *LitValue) (int64, error) {
 	switch {
 	case v == nil:
 		return -1, nil
-	case v.Number == nil:
+	case v.Int == nil:
 		return -1, errBadLimitSpecified
 	default:
-		r := int64(*v.Number)
+		r := int64(*v.Int)
 		if r < 0 {
 			return -1, errBadLimitSpecified
 		}

pkg/s3select/sql/value.go

@@ -306,15 +306,6 @@ func (v Value) CSVString() string {
 	}
 }
 
-// floatToValue converts a float into int representation if needed.
-func floatToValue(f float64) *Value {
-	intPart, fracPart := math.Modf(f)
-	if fracPart == 0 && intPart < math.MaxInt64 && intPart > math.MinInt64 {
-		return FromInt(int64(intPart))
-	}
-	return FromFloat(f)
-}
-
 // negate negates a numeric value
 func (v *Value) negate() {
 	switch x := v.value.(type) {