tdigest_merge() (fungsi agregasi)

Artikel
01/10/2024

Menggabungkan hasil tdigest di seluruh grup.

Catatan

Fungsi ini digunakan bersama dengan ringkasan operator.

Untuk informasi selengkapnya tentang algoritma yang mendasari (T-Digest) dan perkiraan kesalahan, lihat kesalahan estimasi dalam persentil.

Fungsi tdigest_merge() dan merge_tdigest() setara

Penting

Hasil tdigest() dan tdigest_merge() dapat disimpan dan kemudian diambil. Misalnya, Anda mungkin ingin membuat ringkasan persentil harian, yang kemudian dapat digunakan untuk menghitung persentil mingguan. Namun, representasi biner yang tepat dari hasil ini dapat berubah dari waktu ke waktu. Tidak ada jaminan bahwa fungsi-fungsi ini akan menghasilkan hasil yang identik untuk input yang identik, dan oleh karena itu kami tidak menyarankan untuk mengandalkannya.

Sintaks

tdigest_merge(expr)

Pelajari selengkapnya tentang konvensi sintaksis.

Parameter

Nama	Jenis	Diperlukan	Deskripsi
expr	`string`	✔️	Ekspresi yang digunakan untuk perhitungan agregasi.

Mengembalikan

Mengembalikan nilai tdigest yang digabungkan dari expr di seluruh grup.

Catatan

Gunakan fungsi percentile_tdigest() untuk menghitung persentil dari hasil tdigest_merge.
Semua tdigests yang termasuk dalam grup yang sama harus dari jenis yang sama.

Contoh

Menjalankan kueri

StormEvents
| summarize PreAggDamageProperty=tdigest(DamageProperty) by State
| summarize tdigest_merge(PreAggDamageProperty)

Output

merge_tdigests_PreAggDamageProperty
[[7],[91,30,73667,966,110000000,24428,2500,20000,16500000,6292,40000,123208,1000000,133091,90583,20000000,977000,20007,547000,19000000,1221,9600000,300000,70072,55940,75000,417500,1410000,20400000,331500,15000000,62000000,50222,121690000,160400,6200000,252500,450,11000000,2200000,5700000,11566,12000000,263,50000,200000,3700000,13286,171000,100000000,28200000,65000000,17709,30693,16000000,7938,5200,2875,1500000,3480000,151100000,9800000,18200000,21600000,199,2570000,30000000,38000000,72000,891250,500000000,26385,80092,27000000,35000000,754500,11500000,3262500,113945,5000,62429,175294,9071,6500000,3321,15159,21850000,300000000,22683,3000,10000000,60055,600000,52000000,496000,15000,50000000,10140000,11900000,2100000,62600000,77125,310667,70000000,101000000,2088,1608571,19182,400000,179833,775000,612000,150000000,13500000,2600000,1250000,65400,45000000,297000,2500000,40000000,24846,30000,59067,1893,15762,142571,220666,195000,2000000,355000,2275000,6000000,46000000,38264,50857,4002,97333,27750,1000,1111429,7043,272500,455200,503,37500000,10000,1489,0,1200000,110538,60000000,250000,10730,1901429,291000,698750,649000,2716667,137000000,6400000,29286,41051,6850000,102000,4602,80000000,250000000,371667,8000000,729,8120000,5000000,20830,152400,803300,349667,202000,207000,81150000,48000000,750000,26000000,8900000,239143,75000000,248000,14342,74857,5992,500000,150000,938000,10533333,45248,105000000,7000000,35030,4000000,2000,7692500,3000000,25000000,4500000,87222,12054,100000,25000,9771,4840000,28000000,1307143,32024],[19,1,3,32,1,14,45,572,1,51,126,41,101,11,12,8,2,14,4,1,27,1,58,42,20,177,6,4,1,12,10,2,9,1,5,1,2,28,3,6,1,23,4,30,610,145,1,21,4,2,1,1,24,13,1,153,5,4,26,5,1,6,1,1,28,1,5,1,11,4,1,13,44,2,4,2,1,4,9,1672,7,17,47,2,39,17,2,1,17,666,16,71,21,3,1,530,10,1,1,2,1,4,6,4,1,20,7,11,40,6,2,1,1,2,1,3,5,2,1,21,2,13,271,3,14,23,7,15,2,41,1,2,7,1,27,7,205,3,4,1403,7,69,4,10,215,1,1472,127,45756,10,13,1,198,17,7,1,12,7,6,1,1,14,7,2,2,17,1,2,3,2,48,5,21,10,5,10,21,4,5,1,2,39,2,2,7,1,1,22,7,60,175,119,3,3,40,1,8,101,15,1135,4,22,3,3,9,76,430,611,12,1,2,7,8]]

merge_tdigests_PreAggDamageProperty

[[7],[91,30,73667,966,110000000,24428,2500,20000,16500000,6292,40000,123208,1000000,133091,90583,20000000,977000,20007,547000,19000000,1221,9600000,300000,70072,55940,75000,417500,1410000,20400000,331500,15000000,62000000,50222,121690000,160400,6200000,252500,450,11000000,2200000,5700000,11566,12000000,263,50000,200000,3700000,13286,171000,100000000,28200000,65000000,17709,30693,16000000,7938,5200,2875,1500000,3480000,151100000,9800000,18200000,21600000,199,2570000,30000000,38000000,72000,891250,500000000,26385,80092,27000000,35000000,754500,11500000,3262500,113945,5000,62429,175294,9071,6500000,3321,15159,21850000,300000000,22683,3000,10000000,60055,600000,52000000,496000,15000,50000000,10140000,11900000,2100000,62600000,77125,310667,70000000,101000000,2088,1608571,19182,400000,179833,775000,612000,150000000,13500000,2600000,1250000,65400,45000000,297000,2500000,40000000,24846,30000,59067,1893,15762,142571,220666,195000,2000000,355000,2275000,6000000,46000000,38264,50857,4002,97333,27750,1000,1111429,7043,272500,455200,503,37500000,10000,1489,0,1200000,110538,60000000,250000,10730,1901429,291000,698750,649000,2716667,137000000,6400000,29286,41051,6850000,102000,4602,80000000,250000000,371667,8000000,729,8120000,5000000,20830,152400,803300,349667,202000,207000,81150000,48000000,750000,26000000,8900000,239143,75000000,248000,14342,74857,5992,500000,150000,938000,10533333,45248,105000000,7000000,35030,4000000,2000,7692500,3000000,25000000,4500000,87222,12054,100000,25000,9771,4840000,28000000,1307143,32024],[19,1,3,32,1,14,45,572,1,51,126,41,101,11,12,8,2,14,4,1,27,1,58,42,20,177,6,4,1,12,10,2,9,1,5,1,2,28,3,6,1,23,4,30,610,145,1,21,4,2,1,1,24,13,1,153,5,4,26,5,1,6,1,1,28,1,5,1,11,4,1,13,44,2,4,2,1,4,9,1672,7,17,47,2,39,17,2,1,17,666,16,71,21,3,1,530,10,1,1,2,1,4,6,4,1,20,7,11,40,6,2,1,1,2,1,3,5,2,1,21,2,13,271,3,14,23,7,15,2,41,1,2,7,1,27,7,205,3,4,1403,7,69,4,10,215,1,1472,127,45756,10,13,1,198,17,7,1,12,7,6,1,1,14,7,2,2,17,1,2,3,2,48,5,21,10,5,10,21,4,5,1,2,39,2,2,7,1,1,22,7,60,175,119,3,3,40,1,8,101,15,1135,4,22,3,3,9,76,430,611,12,1,2,7,8]]

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