tdigest_merge()tdigest_merge()
合并 tdigest
结果(聚合版 tdigest_merge()
的标量版本)。Merges tdigest
results (scalar version of the aggregate version tdigest_merge()
).
在此处详细了解基础算法 (T-Digest) 和预估误差。Read more about the underlying algorithm (T-Digest) and the estimated error here.
语法Syntax
merge_tdigests(
Expr1,
Expr2, ...)
merge_tdigests(
Expr1,
Expr2, ...)
tdigest_merge(
Expr1,
Expr2, ...)
- 别名。tdigest_merge(
Expr1,
Expr2, ...)
- An alias.
参数Arguments
- 列,包含要合并的
tdigest
值。Columns that have thetdigest
values to be merged.
返回Returns
将列 *Expr1*
、*Expr2*
、... *ExprN*
合并为一个 tdigest
后的结果。The result for merging the columns *Expr1*
, *Expr2*
, ... *ExprN*
to one tdigest
.
示例Examples
range x from 1 to 10 step 1
| extend y = x + 10
| summarize tdigestX = tdigest(x), tdigestY = tdigest(y)
| project merged = tdigest_merge(tdigestX, tdigestY)
| project percentile_tdigest(merged, 100, typeof(long))
percentile_tdigest_mergedpercentile_tdigest_merged |
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2020 |