Github user JamesRTaylor commented on a diff in the pull request:
https://github.com/apache/incubator-phoenix/pull/8#discussion_r10094682
--- Diff:
phoenix-core/src/main/java/org/apache/phoenix/schema/PArrayDataType.java ---
@@ -123,83 +189,69 @@ public Object toObject(byte[] bytes, int offset, int
length, PDataType baseType,
return createPhoenixArray(bytes, offset, length, sortOrder,
baseType);
}
-
- public static void positionAtArrayElement(ImmutableBytesWritable ptr,
int arrayIndex, PDataType baseDataType) {
- byte[] bytes = ptr.get();
- int initPos = ptr.getOffset();
- int noOfElements = 0;
- noOfElements = Bytes.toInt(bytes, ptr.getOffset() +
Bytes.SIZEOF_BYTE, Bytes.SIZEOF_INT);
- int noOFElementsSize = Bytes.SIZEOF_INT;
- if(arrayIndex >= noOfElements) {
- throw new IndexOutOfBoundsException(
- "Invalid index "
- + arrayIndex
- + " specified, greater
than the no of elements in the array: "
- + noOfElements);
- }
- boolean useShort = true;
- int baseSize = Bytes.SIZEOF_SHORT;
- if (noOfElements < 0) {
- noOfElements = -noOfElements;
- baseSize = Bytes.SIZEOF_INT;
- useShort = false;
- }
- if (baseDataType.getByteSize() == null) {
- int offset = ptr.getOffset() + noOFElementsSize +
Bytes.SIZEOF_BYTE;
- int indexOffset = Bytes.toInt(bytes, offset) +
ptr.getOffset();
- int valArrayPostion = offset + Bytes.SIZEOF_INT;
- offset += Bytes.SIZEOF_INT;
- int currOff = 0;
- if (noOfElements > 1) {
- while (offset <= (initPos+ptr.getLength())) {
- int nextOff = 0;
- // Skip those many offsets as given in
the arrayIndex
- // If suppose there are 5 elements in
the array and the arrayIndex = 3
- // This means we need to read the 4th
element of the array
- // So inorder to know the length of the
4th element we will read the offset of 4th element and the offset of 5th
element.
- // Subtracting the offset of 5th
element and 4th element will give the length of 4th element
- // So we could just skip reading the
other elements.
- if(useShort) {
- // If the arrayIndex is already
the last element then read the last before one element and the last element
- offset = indexOffset +
(Bytes.SIZEOF_SHORT * arrayIndex);
- if (arrayIndex == (noOfElements
- 1)) {
- currOff =
Bytes.toShort(bytes, offset, baseSize) + Short.MAX_VALUE;
- nextOff = indexOffset;
- offset += baseSize;
- } else {
- currOff =
Bytes.toShort(bytes, offset, baseSize) + Short.MAX_VALUE;
- offset += baseSize;
- nextOff =
Bytes.toShort(bytes, offset, baseSize) + Short.MAX_VALUE;
- offset += baseSize;
- }
- } else {
- // If the arrayIndex is already
the last element then read the last before one element and the last element
- offset = indexOffset +
(Bytes.SIZEOF_INT * arrayIndex);
- if (arrayIndex == (noOfElements
- 1)) {
- currOff =
Bytes.toInt(bytes, offset, baseSize);
- nextOff = indexOffset;
- offset += baseSize;
- } else {
- currOff =
Bytes.toInt(bytes, offset, baseSize);
- offset += baseSize;
- nextOff =
Bytes.toInt(bytes, offset, baseSize);
- offset += baseSize;
- }
- }
- int elementLength = nextOff - currOff;
- ptr.set(bytes, currOff + initPos,
elementLength);
- break;
- }
- } else {
- ptr.set(bytes, valArrayPostion + initPos,
indexOffset - valArrayPostion);
- }
- } else {
- ptr.set(bytes,
- ptr.getOffset() + arrayIndex *
baseDataType.getByteSize()
- + noOFElementsSize +
Bytes.SIZEOF_BYTE, baseDataType.getByteSize());
- }
- }
+ public static void positionAtArrayElement(ImmutableBytesWritable ptr,
int arrayIndex, PDataType baseDataType) {
+ byte[] bytes = ptr.get();
+ int initPos = ptr.getOffset();
+ int noOfElements = 0;
+ noOfElements = Bytes.toInt(bytes, (ptr.getOffset() +
ptr.getLength() - (Bytes.SIZEOF_BYTE + Bytes.SIZEOF_INT)),
+ Bytes.SIZEOF_INT);
+
+ if (arrayIndex >= noOfElements) { throw new
IndexOutOfBoundsException("Invalid index " + arrayIndex
+ + " specified, greater than the no of eloements in the
array: " + noOfElements); }
+ boolean useShort = true;
+ if (noOfElements < 0) {
+ noOfElements = -noOfElements;
+ useShort = false;
+ }
+
+ if (baseDataType.getByteSize() == null) {
--- End diff --
The fixedWidth needs to passed into this function, as you can't always get
it from the type. For example, a CHAR(5) is fixedWidth, but the type can't know
what the width is. Instead, the expression knows - you can get it by doing a
expression.getByteSize() and passing that in here.
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