BinShi-SecularBird commented on a change in pull request #463: Phoenix stats
Initial Commit
URL: https://github.com/apache/phoenix/pull/463#discussion_r266175445
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File path:
phoenix-core/src/main/java/org/apache/phoenix/compile/ScanRanges.java
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@@ -694,4 +694,127 @@ public TimeRange getRowTimestampRange() {
return rowTimestampRange;
}
+ /**
+ * Produces the list of KeyRanges representing the fully qualified row key
by calling into ScanUtil.setKey
+ * repeatedly for every combination of KeyRanges in the ranges field. The
bounds will be set according to the
+ * properties of the setKey method.
+ *
+ * @return list of KeyRanges representing the fully qualified rowkey,
coalesced
+ */
+ public List<KeyRange> getRowKeyRanges() {
+ // If its scanRanges are everything or nothing, then we short circuit
and leave
+ // as schema is not filled in
+ if (isEverything()) { return
Lists.newArrayList(KeyRange.EVERYTHING_RANGE); }
+ if (isDegenerate()) { return Lists.newArrayList(KeyRange.EMPTY_RANGE);
}
+
+ List<KeyRange> queryRowKeyRanges =
Lists.newArrayListWithExpectedSize(this.ranges.size());
+
+ // Point lookups are stored in the first range as a whole and already
a rowkey
+ // see ScanRanges.getPointLookupKeyIterator
+ if (this.isPointLookup()) {
+ queryRowKeyRanges.addAll(this.getRanges().get(0));
+ } else {
+ // If scanRanges.ranges has no information then should be in the
scanRanges.scanRange
+ if (this.getRanges().size() == 0) {
+ queryRowKeyRanges.add(this.getScanRange());
+ } else { // We have a composite key need the row key from the
combination
+ // make a copy of ranges as we may add items to fully qualify
our rowkey
+ List<List<KeyRange>> ranges = new ArrayList<>();
+ ranges.addAll(this.getRanges());
+
+ int[] slotSpans = this.getSlotSpans();
+
+ // If the ranges here do not qualify all the keys then those
keys are unbound
+ if (ranges.size() < schema.getMaxFields()) {
+ int originalSize = ranges.size();
+ for (int i = 0; i < schema.getMaxFields() - originalSize;
i++) {
+
ranges.add(Lists.newArrayList(KeyRange.EVERYTHING_RANGE));
+ }
+ slotSpans = new int[schema.getMaxFields()];
+ }
+
+ // Product to bound our counting loop for safety
+ int rangesPermutations = 1;
+ for (int i = 0; i < ranges.size(); i++) {
+ rangesPermutations *= ranges.get(i).size();
+ }
+
+ // Have to construct the intersection
+ List<KeyRange> expandedRanges =
Lists.newArrayListWithExpectedSize(rangesPermutations);
+ int[] position = new int[slotSpans.length];
+
+ int maxKeyLength = SchemaUtil.getMaxKeyLength(schema, ranges);
+ byte[] keyBuffer = new byte[maxKeyLength];
+
+ // Counting Loop
+ int count = 0;
+ while (count < rangesPermutations) {
+ byte[] lowerBound;
+ byte[] upperBound;
+
+ // Note ScanUtil.setKey internally handles the upper/lower
exclusive from a Scan
+ // point of view. It would be good to break it out in the
future for rowkey
+ // construction vs ScanKey construction To handle
differences between
+ // hbase 2 and hbase 1 scan boundaries
+ int result = ScanUtil.setKey(schema, ranges, slotSpans,
position, KeyRange.Bound.LOWER, keyBuffer,
+ 0, 0, slotSpans.length);
+
+ if (result < 0) {
+ // unbound
+ lowerBound = KeyRange.UNBOUND;
+ } else {
+ lowerBound = Arrays.copyOf(keyBuffer, result);
+ }
+
+ result = ScanUtil.setKey(schema, ranges, slotSpans,
position, KeyRange.Bound.UPPER, keyBuffer, 0, 0,
+ slotSpans.length);
+
+ if (result < 0) {
+ // unbound
+ upperBound = KeyRange.UNBOUND;
+ } else {
+ upperBound = Arrays.copyOf(keyBuffer, result);
+ }
Review comment:
From line 752 to 777,
I prefer the following code which seems more compact. Thought? This might be
just personal preference.
// comment
int result = ScanUtil.setKey(schema, ranges, slotSpans, position,
KeyRange.Bound.LOWER, keyBuffer, 0, 0, slotSpans.length);
byte[] lowerBound = result < 0 ? KeyRange.UNBOUND :
Arrays.copyOf(keyBuffer, result);
// comment
result = ScanUtil.setKey(schema, ranges, slotSpans, position,
KeyRange.Bound.UPPER, keyBuffer, 0, 0, slotSpans.length);
byte[] upperBound = result < 0 ? KeyRange.UNBOUND :
Arrays.copyOf(keyBuffer, result);
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