siddharthteotia commented on code in PR #9333:
URL: https://github.com/apache/pinot/pull/9333#discussion_r988629632
##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/creator/impl/SegmentColumnarIndexCreator.java:
##########
@@ -296,6 +309,40 @@ public void init(SegmentGeneratorConfig
segmentCreationSpec, SegmentIndexCreatio
}
}
+ /**
+ * Validates the compatibility of the indexes if the column has the forward
index disabled. Throws exceptions due to
+ * compatibility mismatch. The checks performed are:
+ * - Validate dictionary is enabled.
+ * - Validate inverted index is enabled.
+ * - Validate that either no range index exists for column or the range
index version is at least 2 and isn't a
+ * multi-value column (since multi-value defaults to index v1).
+ *
+ * @param columnName Name of the column
+ * @param forwardIndexDisabled Whether the forward index is disabled for
column or not
+ * @param dictEnabledColumn Whether the column is dictionary enabled or not
+ * @param columnIndexCreationInfo Column index creation info
+ * @param invertedIndexColumns Set of columns with inverted index enabled
+ * @param rangeIndexColumns Set of columns with range index enabled
+ * @param rangeIndexVersion Range index version
+ * @param fieldSpec FieldSpec of column
+ */
+ private void validateForwardIndexDisabledIndexCompatibility(String
columnName, boolean forwardIndexDisabled,
+ boolean dictEnabledColumn, ColumnIndexCreationInfo
columnIndexCreationInfo, Set<String> invertedIndexColumns,
+ Set<String> rangeIndexColumns, int rangeIndexVersion, FieldSpec
fieldSpec) {
+ if (!forwardIndexDisabled) {
+ return;
+ }
+
+ Preconditions.checkState(dictEnabledColumn,
+ String.format("Cannot disable forward index for column %s without
dictionary", columnName));
+ Preconditions.checkState(invertedIndexColumns.contains(columnName),
+ String.format("Cannot disable forward index for column %s without
inverted index enabled", columnName));
+ Preconditions.checkState(!rangeIndexColumns.contains(columnName)
+ || (fieldSpec.isSingleValueField() && rangeIndexVersion ==
BitSlicedRangeIndexCreator.VERSION), String.format(
+ "Cannot disable forward index for column %s which has range index
with version < 2 or is multi-value",
Review Comment:
The range index condition and message is little less readable.
Suggest breaking it up like done for others
if range index
- if version < 2 -> feature not supported on column with range index
version < 2. either disable range index or use range index version >=2 to use
this feature
- else if MV -> feature not supported on MV column with range index.
Disable range index on this column in order to use this feature
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