The estRows is inaccurate when there is data skew.

## Bug Report

### 1. Minimal reproduce step (Required)
1. create table like this:
CREATE TABLE `tb` (
`id` int(11) NOT NULL,
`f1` int(11) DEFAULT NULL,
`f2` int(11) DEFAULT NULL,
`f3` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `idx_f1` (`f1`) ,
KEY `idx_f2` (`f2`)
) partition by hash(id)
(partition `p0`,
partition `p1`,
partition `p2`);
2. insert data:
step 1: insert one million records by the following script:
```
#!/bin/bash
HOST="127.0.0.1"
PORT="xxxx"
USER="xxxx"
DB="test"
TABLE="tb"

TOTAL_ROWS=1000000

COUNTER=0

BATCH_SIZE=10000

generate_data() {
local sql="INSERT INTO $TABLE (id, f1, f2, f3) VALUES "
for i in $(seq 1 $BATCH_SIZE); do
local id=$((COUNTER + i))
if ((id > TOTAL_ROWS)); then
break
fi
local f1=$((RANDOM % 1000))
local f2=$((RANDOM % 1000))
local f3=$((RANDOM % 1000))

if [[ $i -ne 1 ]]; then
sql+=","
fi
sql+="($id, $f1, $f2, $f3)"
done
}

while ((COUNTER < TOTAL_ROWS)); do
DATA=$(generate_data)

COUNTER=$((COUNTER + BATCH_SIZE))

sleep 1
done
```
step 2: Insert the following data to construct a data skew
insert into tb (id,f1,f2,f3) values(10000001,10000,102,10000),(20000001,20000,103,20000);
3. Execute analyze table
step 1: analyze table tb;
step 2: analyze table tb update histogram on id,f1,f2;
4. Execute Query
The estRows above is incorrect.

However, what's puzzling is that if we insert 1000 records[Still using the previous script, modifyvariable TOTAL_ROWS to 1000], you will get the correct estRows:

### 2. What did you expect to see?

### 3. What did you see instead

### 4. What is your TiDB version?
pd instance:v8.0.0
tikv instance:v8.0.0
tidb instance:v8.0.0
tiflash instance:v8.0.0