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vam: Add slice expressions for Arrays and Sets
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,150 @@ | ||
| package expr | ||
|
|
||
| import ( | ||
| "github.com/brimdata/super" | ||
| "github.com/brimdata/super/vector" | ||
| ) | ||
|
|
||
| type sliceExpr struct { | ||
| zctx *super.Context | ||
| containerEval, fromEval, toEval Evaluator | ||
| } | ||
|
|
||
| func NewSliceExpr(zctx *super.Context, container, from, to Evaluator) Evaluator { | ||
| return &sliceExpr{ | ||
| zctx: zctx, | ||
| containerEval: container, | ||
| fromEval: from, | ||
| toEval: to, | ||
| } | ||
| } | ||
|
|
||
| func (s *sliceExpr) Eval(vec vector.Any) vector.Any { | ||
| vecs := []vector.Any{s.containerEval.Eval(vec)} | ||
| if s.fromEval != nil { | ||
| vecs = append(vecs, s.fromEval.Eval(vec)) | ||
| } | ||
| if s.toEval != nil { | ||
| vecs = append(vecs, s.toEval.Eval(vec)) | ||
| } | ||
| return vector.Apply(true, s.eval, vecs...) | ||
| } | ||
|
|
||
| func (s *sliceExpr) eval(vecs ...vector.Any) vector.Any { | ||
| container := vecs[0] | ||
| var from, to vector.Any | ||
| vecs = vecs[1:] | ||
| if s.fromEval != nil { | ||
| from = vecs[0] | ||
| if !super.IsSigned(from.Type().ID()) { | ||
| return vector.NewWrappedError(s.zctx, "slice: from value is not an integer", from) | ||
| } | ||
| vecs = vecs[1:] | ||
| } | ||
| if s.toEval != nil { | ||
| to = vecs[0] | ||
| if !super.IsSigned(to.Type().ID()) { | ||
| return vector.NewWrappedError(s.zctx, "slice: to value is not an integer", from) | ||
| } | ||
| } | ||
| switch vector.KindOf(container) { | ||
| case vector.KindSet, vector.KindArray: | ||
| return s.evalArrayOrSlice(container, from, to) | ||
| default: | ||
| return vector.NewWrappedError(s.zctx, "sliced value is not array, set, bytes, or string", container) | ||
| } | ||
| } | ||
|
|
||
| func (s *sliceExpr) evalArrayOrSlice(vec, fromVec, toVec vector.Any) vector.Any { | ||
| from, constFrom := sliceIsConstIndex(fromVec) | ||
| to, constTo := sliceIsConstIndex(toVec) | ||
| slowPath := !constFrom || !constTo | ||
| var index []uint32 | ||
| if view, ok := vec.(*vector.View); ok { | ||
| vec, index = view.Any, view.Index | ||
| } | ||
| offsets, inner, nullsIn := arrayOrSetContents(vec) | ||
| newOffsets := []uint32{0} | ||
| var errs []uint32 | ||
| var innerIndex []uint32 | ||
| var nullsOut *vector.Bool | ||
| for i := range vec.Len() { | ||
| idx := i | ||
| if index != nil { | ||
| idx = index[i] | ||
| } | ||
| if nullsIn.Value(idx) { | ||
| newOffsets = append(newOffsets, newOffsets[len(newOffsets)-1]) | ||
| if nullsOut == nil { | ||
| nullsOut = vector.NewBoolEmpty(vec.Len(), nil) | ||
| } | ||
| nullsOut.Set(i) | ||
| continue | ||
| } | ||
| start := offsets[idx] | ||
| origSize := int64(offsets[idx+1] - start) | ||
| relFrom, relTo := int64(0), origSize | ||
| if fromVec != nil { | ||
| if slowPath { | ||
| from, _ = vector.IntValue(fromVec, idx) | ||
| } | ||
| relFrom = sliceIndex(from, origSize) | ||
| } | ||
| if toVec != nil { | ||
| if slowPath { | ||
| to, _ = vector.IntValue(toVec, idx) | ||
| } | ||
| relTo = sliceIndex(to, origSize) | ||
| } | ||
| if relFrom > relTo || relTo > origSize || relFrom < 0 { | ||
| errs = append(errs, i) | ||
| continue | ||
| } | ||
| newOffsets = append(newOffsets, newOffsets[len(newOffsets)-1]+uint32(relTo-relFrom)) | ||
| for k := relFrom; k < relTo; k++ { | ||
| innerIndex = append(innerIndex, start+uint32(k)) | ||
| } | ||
|
|
||
| } | ||
| var out vector.Any | ||
| inner = vector.NewView(inner, innerIndex) | ||
| if vector.KindOf(vec) == vector.KindArray { | ||
| out = vector.NewArray(vec.Type().(*super.TypeArray), newOffsets, inner, nullsOut) | ||
| } else { | ||
| out = vector.NewSet(vec.Type().(*super.TypeSet), newOffsets, inner, nullsOut) | ||
| } | ||
| if nullsOut != nil { | ||
| nullsOut.SetLen(out.Len()) | ||
| } | ||
| if len(errs) > 0 { | ||
| errOut := vector.NewStringError(s.zctx, "slice out of bounds", uint32(len(errs))) | ||
| return vector.Combine(out, errs, errOut) | ||
| } | ||
| return out | ||
| } | ||
|
|
||
| func sliceIsConstIndex(vec vector.Any) (int64, bool) { | ||
| if vec == nil { | ||
| return 0, true | ||
| } | ||
| if c, ok := vec.(*vector.Const); ok && c.Nulls == nil { | ||
| return c.Value().Int(), true | ||
| } | ||
| return 0, false | ||
| } | ||
|
|
||
| func sliceIndex(idx, size int64) int64 { | ||
| if idx < 0 { | ||
| idx += int64(size) | ||
| } | ||
| return idx | ||
| } | ||
|
|
||
| func arrayOrSetContents(vec vector.Any) ([]uint32, vector.Any, *vector.Bool) { | ||
| if array, ok := vec.(*vector.Array); ok { | ||
| return array.Offsets, array.Values, array.Nulls | ||
| } else { | ||
| set := vec.(*vector.Set) | ||
| return set.Offsets, set.Values, set.Nulls | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,20 @@ | ||
| zed: "yield c[start:end]" | ||
|
|
||
| vector: true | ||
|
|
||
| input: | | ||
| {start:1,end:-1,c:null([int64])} | ||
| {start:1,end:-1,c:[1,2,3,4]} | ||
| {start:-3,end:3,c:[5,7,8,9]} | ||
| {start:-5,end:3,c:[5,7,8,9]} | ||
| {start:0,end:5,c:[5,7,8,9]} | ||
| {start:4,end:3,c:[5,7,8,9]} | ||
| output: | | ||
| null([int64]) | ||
| [2,3] | ||
| [7,8] | ||
| error("slice out of bounds") | ||
| error("slice out of bounds") | ||
| error("slice out of bounds") | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,19 @@ | ||
| zed: "yield c[start:end]" | ||
|
|
||
| vector: true | ||
|
|
||
| input: | | ||
| {start:1,end:-1,c:null(|[int64]|)} | ||
| {start:1,end:-1,c:|[1,2,3,4]|} | ||
| {start:-3,end:3,c:|[5,7,8,9]|} | ||
| {start:-5,end:3,c:|[5,7,8,9]|} | ||
| {start:0,end:5,c:|[5,7,8,9]|} | ||
| {start:4,end:3,c:|[5,7,8,9]|} | ||
| output: | | ||
| null(|[int64]|) | ||
| |[2,3]| | ||
| |[7,8]| | ||
| error("slice out of bounds") | ||
| error("slice out of bounds") | ||
| error("slice out of bounds") |
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