trxcllnt commented on code in PR #320:
URL: https://github.com/apache/arrow-js/pull/320#discussion_r2484244927
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src/visitor/get.ts:
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@@ -149,10 +154,39 @@ const getFixedSizeBinary = <T extends FixedSizeBinary>({
stride, values }: Data<
/** @ignore */
const getBinary = <T extends Binary | LargeBinary>({ values, valueOffsets }:
Data<T>, index: number): T['TValue'] => getVariableWidthBytes(values,
valueOffsets, index);
/** @ignore */
+const getBinaryViewValue = <T extends BinaryView>(data: Data<T>, index:
number): T['TValue'] => {
+ const values = data.values as Uint8Array;
+ if (!values) {
+ throw new Error('BinaryView data is missing view buffer');
+ }
+ const start = (data.offset + index) * BINARY_VIEW_SIZE;
+ const baseOffset = values.byteOffset + start;
+ const view = new DataView(values.buffer, baseOffset, BINARY_VIEW_SIZE);
+ const size = view.getInt32(0, true);
+ if (size <= 0) {
+ return new Uint8Array(0) as T['TValue'];
+ }
+ if (size <= BINARY_VIEW_INLINE_CAPACITY) {
+ return new Uint8Array(values.buffer, baseOffset + 4, size) as
T['TValue'];
+ }
+ const bufferIndex = view.getInt32(8, true);
+ const offset = view.getInt32(12, true);
+ const variadicBuffer = data.variadicBuffers?.[bufferIndex];
+ if (!variadicBuffer) {
+ throw new Error(`BinaryView variadic buffer ${bufferIndex} is
missing`);
+ }
+ return variadicBuffer.subarray(offset, offset + size) as T['TValue'];
+};
+/** @ignore */
const getUtf8 = <T extends Utf8 | LargeUtf8>({ values, valueOffsets }:
Data<T>, index: number): T['TValue'] => {
const bytes = getVariableWidthBytes(values, valueOffsets, index);
return bytes !== null ? decodeUtf8(bytes) : null as any;
};
+/** @ignore */
+const getUtf8ViewValue = <T extends Utf8View>(data: Data<T>, index: number):
T['TValue'] => {
+ const bytes = getBinaryViewValue(data as unknown as Data<BinaryView>,
index);
+ return decodeUtf8(bytes as unknown as Uint8Array);
Review Comment:
Don't like that we have to cast to any here... could the `Utf8View` type
extend `BinaryView`, then just override the `TValue` field type?
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