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select: add MISSING operator support (#14406)

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Probably not full support, but for regular checks it should work.

Fixes #14358
This commit is contained in:
Klaus Post
2022-02-25 12:31:19 -08:00
committed by GitHub
parent e43cc316ff
commit 88fd1cba71
8 changed files with 153 additions and 29 deletions
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4
internal/s3select/sql/evaluate.go
View File

@@ -449,6 +449,8 @@ func jsonToValue(result interface{}) (*Value, error) {
return FromArray(rval), nil
case nil:
return FromNull(), nil
case Missing:
return FromMissing(), nil
}
return nil, fmt.Errorf("Unhandled value type: %T", result)
}
@@ -493,6 +495,8 @@ func (e *LitValue) evalNode(_ Record) (res *Value, err error) {
return FromString(string(*e.String)), nil
case e.Boolean != nil:
return FromBool(bool(*e.Boolean)), nil
case e.Missing:
return FromMissing(), nil
}
return FromNull(), nil
}

4
internal/s3select/sql/jsonpath.go
View File

@@ -52,12 +52,12 @@ func jsonpathEval(p []*JSONPathElement, v interface{}) (r interface{}, flat bool
}
}
// Key not found - return nil result
return nil, false, nil
return Missing{}, false, nil
case simdjson.Object:
elem := kvs.FindKey(key, nil)
if elem == nil {
// Key not found - return nil result
return nil, false, nil
return Missing{}, false, nil
}
val, err := IterToValue(elem.Iter)
if err != nil {

46
internal/s3select/sql/jsonpath_test.go
View File

@@ -66,32 +66,34 @@ func TestJsonpathEval(t *testing.T) {
{"s.authorInfo.yearRange", []interface{}{[]interface{}{1890.0, 1976.0}, []interface{}{1920.0, 1992.0}, []interface{}{1881.0, 1975.0}}},
{"s.authorInfo.name", []interface{}{"Agatha Christie", "Isaac Asimov", "P. G. Wodehouse"}},
{"s.authorInfo.yearRange[0]", []interface{}{1890.0, 1920.0, 1881.0}},
{"s.publicationHistory[0].pages", []interface{}{256.0, 336.0, nil}},
{"s.publicationHistory[0].pages", []interface{}{256.0, 336.0, Missing{}}},
}
for i, tc := range cases {
jp := JSONPath{}
err := p.ParseString(tc.str, &jp)
// fmt.Println(jp)
if err != nil {
t.Fatalf("parse failed!: %d %v %s", i, err, tc)
}
// Read only the first json object from the file
recs, err := getJSONStructs(b)
if err != nil || len(recs) != 3 {
t.Fatalf("%v or length was not 3", err)
}
for j, rec := range recs {
// fmt.Println(rec)
r, _, err := jsonpathEval(jp.PathExpr, rec)
t.Run(tc.str, func(t *testing.T) {
jp := JSONPath{}
err := p.ParseString(tc.str, &jp)
// fmt.Println(jp)
if err != nil {
t.Errorf("Error: %d %d %v", i, j, err)
t.Fatalf("parse failed!: %d %v %s", i, err, tc)
}
if !reflect.DeepEqual(r, tc.res[j]) {
fmt.Printf("%#v (%v) != %v (%v)\n", r, reflect.TypeOf(r), tc.res[j], reflect.TypeOf(tc.res[j]))
t.Errorf("case: %d %d failed", i, j)
// Read only the first json object from the file
recs, err := getJSONStructs(b)
if err != nil || len(recs) != 3 {
t.Fatalf("%v or length was not 3", err)
}
}
for j, rec := range recs {
// fmt.Println(rec)
r, _, err := jsonpathEval(jp.PathExpr, rec)
if err != nil {
t.Errorf("Error: %d %d %v", i, j, err)
}
if !reflect.DeepEqual(r, tc.res[j]) {
fmt.Printf("%#v (%v) != %v (%v)\n", r, reflect.TypeOf(r), tc.res[j], reflect.TypeOf(tc.res[j]))
t.Errorf("case: %d %d failed", i, j)
}
}
})
}
}

5
internal/s3select/sql/parser.go
View File

@@ -340,7 +340,8 @@ type LitValue struct {
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\")"`
Null bool `parser:" | @\"NULL\""`
Missing bool `parser:" | @\"MISSING\")"`
}
// Identifier represents a parsed identifier
@@ -352,7 +353,7 @@ type Identifier struct {
var (
sqlLexer = lexer.Must(lexer.Regexp(`(\s+)` +
`|(?P<Timeword>(?i)\b(?:YEAR|MONTH|DAY|HOUR|MINUTE|SECOND|TIMEZONE_HOUR|TIMEZONE_MINUTE)\b)` +
`|(?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<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|MISSING)\b)` +
`|(?P<Ident>[a-zA-Z_][a-zA-Z0-9_]*)` +
`|(?P<QuotIdent>"([^"]*("")?)*")` +
`|(?P<Float>\d*\.\d+([eE][-+]?\d+)?)` +

37
internal/s3select/sql/value.go
View File

@@ -49,6 +49,9 @@ type Value struct {
value interface{}
}
// Missing is used to indicate a non-existing value.
type Missing struct{}
// MarshalJSON provides json marshaling of values.
func (v Value) MarshalJSON() ([]byte, error) {
if b, ok := v.ToBytes(); ok {
@@ -76,6 +79,8 @@ func (v Value) GetTypeString() string {
return "BYTES"
case []Value:
return "ARRAY"
case Missing:
return "MISSING"
}
return "--"
}
@@ -104,6 +109,8 @@ func (v Value) Repr() string {
}
s.WriteString("]:ARRAY")
return s.String()
case Missing:
return ":MISSING"
default:
return fmt.Sprintf("%v:INVALID", v.value)
}
@@ -139,6 +146,11 @@ func FromNull() *Value {
return &Value{value: nil}
}
// FromMissing creates a Value with Missing value
func FromMissing() *Value {
return &Value{value: Missing{}}
}
// FromBytes creates a Value from a []byte
func FromBytes(b []byte) *Value {
return &Value{value: b}
@@ -239,6 +251,12 @@ func (v Value) IsNull() bool {
return false
}
// IsMissing - checks if value is missing.
func (v Value) IsMissing() bool {
_, ok := v.value.(Missing)
return ok
}
// IsArray returns whether the value is an array.
func (v Value) IsArray() (ok bool) {
_, ok = v.value.([]Value)
@@ -283,7 +301,7 @@ func (v Value) String() string {
// CSVString - convert to string for CSV serialization
func (v Value) CSVString() string {
switch x := v.value.(type) {
case nil:
case nil, Missing:
return ""
case bool:
if x {
@@ -390,13 +408,21 @@ func (v *Value) compareOp(op string, a *Value) (res bool, err error) {
switch op {
case opIs:
if a.IsNull() {
return v.IsNull(), nil
// Missing is null
return v.IsNull() || v.IsMissing(), nil
}
if a.IsMissing() {
return v.IsMissing(), nil
}
// Forward to Equal
op = opEq
case opIsNot:
if a.IsNull() {
return !v.IsNull(), nil
// Missing is not null
return !v.IsNull() && !v.IsMissing(), nil
}
if a.IsMissing() {
return !v.IsMissing(), nil
}
// Forward to not equal.
op = opIneq
@@ -416,6 +442,11 @@ func (v *Value) compareOp(op string, a *Value) (res bool, err error) {
return boolCompare(op, v.IsNull(), a.IsNull())
}
if a.IsMissing() || v.IsMissing() {
// If one is, both must be.
return boolCompare(op, v.IsMissing(), a.IsMissing())
}
// Check array values
aArr, aOK := a.ToArray()
vArr, vOK := v.ToArray()