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- Added mv_median_absolute_deviation function - Added possibility of having a fixed param in Multivalue "ascending" functions - Add surrogate to MedianAbsoluteDeviation ### Calculations used to avoid overflows First, a quick recap of how the MAD is calculated: 1. Sort values, and get the median 2. Calculate the difference between each value with the median (`abs(median - value)`) 3. Sort the differences, and get their median Calculating a MAD may overflow when calculating the differences (Step 2), given the type is a signed number, as the difference is a positive value, with potentially the same value as `POSITIVE_MAX - NEGATIVE_MIN`. To solve this, some types are up-casted as follow: - Int: Stored as longs, simple approach - Long: Stored as longs, but switched to unsigned long representation when calculating the differences - Unsigned long: No effect; the resulting range is the same - Doubles: Nothing. If the values overflow to +/-infinity, they're left that way, as we'll just use those outliers to sort Closes https://github.com/elastic/elasticsearch/issues/111590
44 lines
1.1 KiB
Text
44 lines
1.1 KiB
Text
[[esql-mv-functions]]
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==== {esql} multivalue functions
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++++
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<titleabbrev>Multivalue functions</titleabbrev>
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++++
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{esql} supports these multivalue functions:
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// tag::mv_list[]
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* <<esql-mv_append>>
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* <<esql-mv_avg>>
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* <<esql-mv_concat>>
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* <<esql-mv_count>>
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* <<esql-mv_dedupe>>
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* <<esql-mv_first>>
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* <<esql-mv_last>>
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* <<esql-mv_max>>
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* <<esql-mv_median>>
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* <<esql-mv_median_absolute_deviation>>
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* <<esql-mv_min>>
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* <<esql-mv_pseries_weighted_sum>>
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* <<esql-mv_sort>>
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* <<esql-mv_slice>>
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* <<esql-mv_sum>>
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* <<esql-mv_zip>>
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// end::mv_list[]
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include::layout/mv_append.asciidoc[]
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include::layout/mv_avg.asciidoc[]
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include::layout/mv_concat.asciidoc[]
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include::layout/mv_count.asciidoc[]
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include::layout/mv_dedupe.asciidoc[]
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include::layout/mv_first.asciidoc[]
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include::layout/mv_last.asciidoc[]
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include::layout/mv_max.asciidoc[]
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include::layout/mv_median.asciidoc[]
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include::layout/mv_median_absolute_deviation.asciidoc[]
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include::layout/mv_min.asciidoc[]
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include::layout/mv_pseries_weighted_sum.asciidoc[]
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include::layout/mv_slice.asciidoc[]
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include::layout/mv_sort.asciidoc[]
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include::layout/mv_sum.asciidoc[]
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include::layout/mv_zip.asciidoc[]
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