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Fix references for distinctCountHLLMv and distinctCountBitmapMv #271

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Dec 29, 2023
Merged

Fix references for distinctCountHLLMv and distinctCountBitmapMv #271

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4685d49
Fix references for distinctCountHLLMv and distinctCountBitmapMv
deemoliu Dec 27, 2023
ed41722
Update configuration-reference/functions/distinctcountbitmapmv.md
kelseiv Dec 29, 2023
49eb3ec
Update configuration-reference/functions/distinctcounthllmv.md
kelseiv Dec 29, 2023
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20 changes: 15 additions & 5 deletions configuration-reference/functions/distinctcountbitmapmv.md
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Original file line number Diff line number Diff line change
@@ -1,27 +1,37 @@
---
description: >-
This section contains reference documentation for the DISTINCTCOUNTHLLMV
function.
This section contains reference documentation for the DISTINCTCOUNTBITMAPMV
function.
---

# DISTINCTCOUNTBITMAPMV

Returns an approximate distinct count using HyperLogLog in a group
Returns the count of distinct row values in a group. This function is accurate for an INT or dictionary encoded column, but approximate for other cases where hash codes are used in distinct counting and there may be hash collision.

## Signature

> DISTINCTCOUNTHLLMV(colName)
> DISTINCTCOUNTBITMAPMV(colName)

## Usage Examples

These examples are based on the [Hybrid Quick Start](../../basics/getting-started/quick-start.md#hybrid).

```sql
select DISTINCTCOUNTHLLMV(DivLongestGTimes) AS value
select DISTINCTCOUNTBITMAPMV(DivLongestGTimes) AS value
from airlineStats
where arraylength(DivLongestGTimes) > 1
```

| value |
| ----- |
| 34 |

```sql
select DISTINCTCOUNTBITMAPMV(DivTailNums) AS value
from airlineStats
where arraylength(DivTailNums) > 1
```

| value |
| ----- |
| 2 |
20 changes: 5 additions & 15 deletions configuration-reference/functions/distinctcounthllmv.md
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Open in desktop
Original file line number Diff line number Diff line change
@@ -1,37 +1,27 @@
---
description: >-
This section contains reference documentation for the DISTINCTCOUNTBITMAPMV
function.
This section contains reference documentation for the DISTINCTCOUNTHLLMV
function.
---

# DISTINCTCOUNTHLLMV

Returns the count of distinct row values in a group. This function is accurate for INT or dictionary encoded column, but approximate for other cases where hash codes are used in distinct counting and there may be hash collision.
Returns an approximate distinct count using HyperLogLog in a group.

## Signature

> DISTINCTCOUNTBITMAPMV(colName)
> DISTINCTCOUNTHLLMV(colName)

## Usage Examples

These examples are based on the [Hybrid Quick Start](../../basics/getting-started/quick-start.md#hybrid).

```sql
select DISTINCTCOUNTBITMAPMV(DivLongestGTimes) AS value
select DISTINCTCOUNTHLLMV(DivLongestGTimes) AS value
from airlineStats
where arraylength(DivLongestGTimes) > 1
```

| value |
| ----- |
| 34 |

```sql
select DISTINCTCOUNTBITMAPMV(DivTailNums) AS value
from airlineStats
where arraylength(DivTailNums) > 1
```

| value |
| ----- |
| 2 |