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e270362767
* Add lastString and firstString aggregators extension * Remove duplicated class * Move first-last-string doc page to extensions-contrib * Fix ObjectStrategy compare method * Fix doc bad aggregatos type name * Create FoldingAggregatorFactory classes to fix SegmentMetadataQuery * Add getMaxStringBytes() method to support JSON serialization * Fix null pointer exception at segment creation phase when the string value is null * Control the valueSelector object class on BufferAggregators * Perform all improvements * Add java doc on SerializablePairLongStringSerde * Refactor ObjectStraty compare method * Remove unused ; * Add aggregateCombiner unit tests. Rename BufferAggregators unit tests * Remove unused imports * Add license header * Add class name to java doc class serde * Throw exception if value is unsupported class type * Move first-last-string extension into druid core * Update druid core docs * Fix null pointer exception when pair->string is null * Add null control unit tests * Remove unused imports * Add first/last string folding aggregator on AggregatorsModule to support segment metadata query * Change SerializablePairLongString to extend SerializablePair * Change vars from public to private * Convert vars to primitive type * Clarify compare comment * Change IllegalStateException to ISE * Remove TODO comments * Control possible null pointer exception * Add @Nullable annotation * Remove empty line * Remove unused parameter type * Improve AggregatorCombiner javadocs * Add filterNullValues option at StringLast and StringFirst aggregators * Add filterNullValues option at agg documentation * Fix checkstyle * Update header license * Fix StringFirstAggregatorFactory.VALUE_COMPARATOR * Fix StringFirstAggregatorCombiner * Fix if condition at StringFirstAggregateCombiner * Remove filterNullValues from string first/last aggregators * Add isReset flag in FirstAggregatorCombiner * Change Arrays.asList to Collections.singletonList