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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| use test; | ||
| drop table if exists t; | ||
| create table t( | ||
| customer_id bigint, | ||
| id bigint, | ||
| expected_shard bigint unsigned, | ||
| computed_shard bigint unsigned null, | ||
| primary key (customer_id, id) | ||
| ); | ||
| create index t_vitess_shard on t((vitess_hash(customer_id) >> 56)); | ||
| explain format = 'brief' select customer_id from t where (vitess_hash(customer_id) >> 56) = x'd6' ORDER BY id; | ||
| id estRows task access object operator info | ||
| Projection 10.00 root test.t.customer_id | ||
| └─Sort 10.00 root test.t.id | ||
| └─IndexLookUp 10.00 root | ||
| ├─IndexRangeScan(Build) 10.00 cop[tikv] table:t, index:t_vitess_shard(vitess_hash(`customer_id`) >> 56) range:[214,214], keep order:false, stats:pseudo | ||
| └─TableRowIDScan(Probe) 10.00 cop[tikv] table:t keep order:false, stats:pseudo | ||
| explain format = 'brief' select id from t where (vitess_hash(customer_id) >> 56) IN (x'e0', x'e1') AND id BETWEEN 2 AND 5 ORDER BY id; | ||
| id estRows task access object operator info | ||
| Projection 0.50 root test.t.id | ||
| └─Sort 0.50 root test.t.id | ||
| └─IndexLookUp 0.50 root | ||
| ├─IndexRangeScan(Build) 20.00 cop[tikv] table:t, index:t_vitess_shard(vitess_hash(`customer_id`) >> 56) range:[224,224], [225,225], keep order:false, stats:pseudo | ||
| └─Selection(Probe) 0.50 cop[tikv] ge(test.t.id, 2), le(test.t.id, 5) | ||
| └─TableRowIDScan 20.00 cop[tikv] table:t keep order:false, stats:pseudo | ||
| explain format = 'brief' select hex(vitess_hash(1123)) from t; | ||
| id estRows task access object operator info | ||
| Projection 10000.00 root 31B565D41BDF8CA->Column#7 | ||
| └─IndexReader 10000.00 root index:IndexFullScan | ||
| └─IndexFullScan 10000.00 cop[tikv] table:t, index:t_vitess_shard(vitess_hash(`customer_id`) >> 56) keep order:false, stats:pseudo |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| use test; | ||
| drop table if exists t; | ||
| create table t( | ||
| customer_id bigint, | ||
| id bigint, | ||
| expected_shard bigint unsigned, | ||
| computed_shard bigint unsigned null, | ||
| primary key (customer_id, id) | ||
| ); | ||
| create index t_vitess_shard on t((vitess_hash(customer_id) >> 56)); | ||
| explain format = 'brief' select customer_id from t where (vitess_hash(customer_id) >> 56) = x'd6' ORDER BY id; | ||
| explain format = 'brief' select id from t where (vitess_hash(customer_id) >> 56) IN (x'e0', x'e1') AND id BETWEEN 2 AND 5 ORDER BY id; | ||
| explain format = 'brief' select hex(vitess_hash(1123)) from t; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| // Copyright 2021 PingCAP, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package vitess | ||
|
|
||
| import ( | ||
| "crypto/cipher" | ||
| "crypto/des" | ||
| "encoding/binary" | ||
|
|
||
| "github.com/pingcap/errors" | ||
| ) | ||
|
|
||
| var nullKeyBlock cipher.Block | ||
|
|
||
| func init() { | ||
| var err error | ||
| nullKeyBlock, err = des.NewCipher(make([]byte, 8)) | ||
| if err != nil { | ||
| panic(errors.Trace(err)) | ||
| } | ||
| } | ||
|
|
||
| // HashUint64 implements vitess' method of calculating a hash used for determining a shard key range. | ||
| // Uses a DES encryption with 64 bit key, 64 bit block, null-key | ||
| func HashUint64(shardKey uint64) (uint64, error) { | ||
| var keybytes [8]byte | ||
| binary.BigEndian.PutUint64(keybytes[:], shardKey) | ||
| var hashed [8]byte | ||
| nullKeyBlock.Encrypt(hashed[:], keybytes[:]) | ||
| return binary.BigEndian.Uint64(hashed[:]), nil | ||
| } |
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