Merge pull request #872 from influxdata/syntax/update-csv
Line protocol and annotated CSVpull/905/head
Scott Anderson
GitHub
commit
eca7c6ce41
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@ -2,8 +2,9 @@
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title: Annotated CSV syntax
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title: Annotated CSV syntax
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list_title: Annotated CSV
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list_title: Annotated CSV
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description: >
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description: >
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Flux returns raw results in Annotated CSV format and also reads Annotated CSV
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InfluxDB and Flux return query results in annotated CSV format.
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using the `csv.from()` function.
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You can also read annotated CSV directly from Flux with the `csv.from()` function
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or write data to InfluxDB using annotated CSV and the `influx write` command.
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weight: 103
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weight: 103
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menu:
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menu:
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v2_0_ref:
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v2_0_ref:
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@ -14,12 +15,12 @@ aliases:
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- /v2.0/reference/annotated-csv/
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- /v2.0/reference/annotated-csv/
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---
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---
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Flux returns raw results in Annotated CSV format and also reads Annotated CSV
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InfluxDB and Flux return query results in annotated CSV format.
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using the [`csv.from()` function](/v2.0/reference/flux/stdlib/csv/from/).
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You can also read annotated CSV directly from Flux with the [`csv.from()` function](/v2.0/reference/flux/stdlib/csv/from/)
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or write data to InfluxDB using annotated CSV and the `influx write` command.
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CSV tables must be encoded in UTF-8 and Unicode Normal Form C as defined in [UAX15](http://www.unicode.org/reports/tr15/).
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CSV tables must be encoded in UTF-8 and Unicode Normal Form C as defined in [UAX15](http://www.unicode.org/reports/tr15/).
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Line endings must be CRLF (Carriage Return Line Feed) as defined by the `text/csv`
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InfluxDB removes carriage returns before newline characters.
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MIME type in [RFC 4180](https://tools.ietf.org/html/rfc4180).
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## Examples
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## Examples
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@ -59,7 +60,7 @@ Encoding of a table with and without a header row.
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{{% /code-tabs %}}
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{{% /code-tabs %}}
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{{% code-tab-content %}}
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{{% code-tab-content %}}
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```js
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```sh
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result,table,_start,_stop,_time,region,host,_value
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result,table,_start,_stop,_time,region,host,_value
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my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:00Z,east,A,15.43
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my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:00Z,east,A,15.43
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my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:20Z,east,B,59.25
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my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:20Z,east,B,59.25
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@ -68,7 +69,7 @@ my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:40Z,east,
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{{% /code-tab-content %}}
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{{% /code-tab-content %}}
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{{% code-tab-content %}}
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{{% code-tab-content %}}
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```js
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```sh
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my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:00Z,east,A,15.43
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my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:00Z,east,A,15.43
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my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:20Z,east,B,59.25
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my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:20Z,east,B,59.25
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my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:40Z,east,C,52.62
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my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:40Z,east,C,52.62
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@ -111,7 +112,7 @@ Encoding of two tables in the same result with the same schema (header row) and
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{{% /code-tabs %}}
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{{% /code-tabs %}}
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{{% code-tab-content %}}
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{{% code-tab-content %}}
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```js
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```sh
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result,table,_start,_stop,_time,region,host,_value
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result,table,_start,_stop,_time,region,host,_value
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my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:00Z,east,A,15.43
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my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:00Z,east,A,15.43
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my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:20Z,east,B,59.25
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my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:20Z,east,B,59.25
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@ -124,7 +125,7 @@ my-result,1,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:40Z,west,
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{{% /code-tab-content %}}
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{{% /code-tab-content %}}
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{{% code-tab-content %}}
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{{% code-tab-content %}}
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```js
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```sh
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,result,table,_start,_stop,_time,region,host,_value
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,result,table,_start,_stop,_time,region,host,_value
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,my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:00Z,east,A,15.43
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,my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:00Z,east,A,15.43
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,my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:20Z,east,B,59.25
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,my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:20Z,east,B,59.25
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@ -138,7 +139,7 @@ my-result,1,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:40Z,west,
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{{% /code-tab-content %}}
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{{% /code-tab-content %}}
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{{< /code-tabs-wrapper >}}
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{{< /code-tabs-wrapper >}}
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### Dialect options
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## Dialect options
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Flux supports the following dialect options for `text/csv` format.
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Flux supports the following dialect options for `text/csv` format.
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@ -150,7 +151,7 @@ Flux supports the following dialect options for `text/csv` format.
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| **annotations** | List of annotations to encode (datatype, group, or default). | `empty` |
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| **annotations** | List of annotations to encode (datatype, group, or default). | `empty` |
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| **commentPrefix** | String prefix to identify a comment. Always added to annotations. | `#` |
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| **commentPrefix** | String prefix to identify a comment. Always added to annotations. | `#` |
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### Annotations
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## Annotations
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Annotation rows describe column properties, and start with `#` (or commentPrefix value).
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Annotation rows describe column properties, and start with `#` (or commentPrefix value).
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The first column in an annotation row always contains the annotation name.
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The first column in an annotation row always contains the annotation name.
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@ -158,17 +159,97 @@ Subsequent columns contain annotation values as shown in the table below.
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| Annotation name | Values | Description |
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| Annotation name | Values | Description |
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|:-------- |:--------- | :------- |
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|:-------- |:--------- | :------- |
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| **datatype** | a [valid data type](#valid-data-types) | Describes the type of data. |
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| **datatype** | a [data type](#data-types) or [line protocol element](#line-protocol-elements) | Describes the type of data or which line protocol element the column represents. |
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| **group** | boolean flag `true` or `false` | Indicates the column is part of the group key. |
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| **group** | boolean flag `true` or `false` | Indicates the column is part of the group key. |
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| **default** | a [valid data type](#valid-data-types) | Value to use for rows with an empty string value. |
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| **default** | a value of the column's data type | Value to use for rows with an empty value. |
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{{% note %}}
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{{% note %}}
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To encode a table with its group key, the `datatype`, `group`, and `default` annotations must be included. If a table has no rows, the `default` annotation provides the group key values.
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To encode a table with its [group key](/v2.0/reference/glossary/#group-key),
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the `datatype`, `group`, and `default` annotations must be included.
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If a table has no rows, the `default` annotation provides the group key values.
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{{% /note %}}
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{{% /note %}}
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##### Example
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## Data types
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Example encoding of datatype, group, and default annotations.
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| Datatype | Flux type | Description |
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| :-------- | :--------- | :---------- |
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| boolean | bool | "true" or "false" |
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| unsignedLong | uint | unsigned 64-bit integer |
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| long | int | signed 64-bit integer |
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| double | float | IEEE-754 64-bit floating-point number |
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| string | string | UTF-8 encoded string |
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| base64Binary | bytes | base64 encoded sequence of bytes as defined in RFC 4648 |
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| dateTime | time | instant in time, may be followed with a colon : and a description of the format (number, RFC3339, RFC3339Nano) |
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| duration | duration | length of time represented as an unsigned 64-bit integer number of nanoseconds |
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## Line protocol elements
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The `datatype` annotation accepts accepts [data types](#data-types) and **line protocol elements**.
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Line protocol elements identify how columns are converted into line protocol when using the
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[`influx write` command](/v2.0/reference/cli/influx/write/) to write annotated CSV to InfluxDB.
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| Line protocol element | Description |
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|:--------------------- |:----------- |
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| `measurement` | column value is the measurement |
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| `field` _(default)_ | column header is the field key, column value is the field value |
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| `tag` | column header is the tag key, column value is the tag value |
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| `time` | column value is the timestamp _(alias for `dateTime`)_ |
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| `ignore` or`ignored` | column is ignored and not included in line protocol |
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### Mixing data types and line protocol elements
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Columns with [data types](#data-types) (other than `dateTime`) in the
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`#datatype` annotation are treated as **fields** when converted to line protocol.
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Columns without a specified data type default to `field` when converted to line protocol
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and **column values are left unmodified** in line protocol.
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_See an example [below](#example-of-mixing-data-types-line-protocol-elements) and
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[line protocol data types and format](/v2.0/reference/syntax/line-protocol/#data-types-and-format)._
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### Time columns
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A column with `time` or `dateTime` `#datatype` annotations are used as the timestamp
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when converted to line protocol.
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If there are multiple `time` or `dateTime` columns, the last column (on the right)
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is used as the timestamp in line protocol.
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Other time columns are ignored and the `influx write` command outputs a warning.
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Time column values should be **Unix timestamps** (in an [accepted timestamp precision](/v2.0/write-data/#timestamp-precision)),
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**RFC3339**, or **RFC3339Nano**.
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##### Example line protocol elements in datatype annotation
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```
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#datatype measurement,tag,tag,field,field,ignored,time
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m,cpu,host,time_steal,usage_user,nothing,time
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cpu,cpu1,host1,0,2.7,a,1482669077000000000
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cpu,cpu1,host2,0,2.2,b,1482669087000000000
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```
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Resulting line protocol:
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```
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cpu,cpu=cpu1,host=host1 time_steal=0,usage_user=2.7 1482669077000000000
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cpu,cpu=cpu1,host=host2 time_steal=0,usage_user=2.2 1482669087000000000
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```
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##### Example of mixing data types line protocol elements
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```
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#datatype measurement,tag,string,double,boolean,long,unsignedLong,duration,dateTime
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#default test,annotatedDatatypes,,,,,,
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m,name,s,d,b,l,ul,dur,time
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,,str1,1.0,true,1,1,1ms,1
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,,str2,2.0,false,2,2,2us,2020-01-11T10:10:10Z
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```
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Resulting line protocol:
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```
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test,name=annotatedDatatypes s="str1",d=1,b=true,l=1i,ul=1u,dur=1000000i 1
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test,name=annotatedDatatypes s="str2",d=2,b=false,l=2i,ul=2u,dur=2000i 1578737410000000000
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```
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## Annotated CSV in Flux
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Flux requires all annotation and header rows in annotated CSV.
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The example below illustrates how to use the [`csv.from()` function](/v2.0/reference/flux/stdlib/csv/from/)
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to read annotated CSV in Flux:
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```js
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```js
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import "csv"
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import "csv"
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@ -177,29 +258,21 @@ csvData = "#datatype,string,long,dateTime:RFC3339,dateTime:RFC3339,dateTime:RFC3
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#group,false,false,false,false,false,false,false,false
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#group,false,false,false,false,false,false,false,false
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#default,,,,,,,,
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#default,,,,,,,,
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,result,table,_start,_stop,_time,region,host,_value
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,result,table,_start,_stop,_time,region,host,_value
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,my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:00Z,east,A,15.43
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,,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:00Z,east,A,15.43
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,my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:20Z,east,B,59.25
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,,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:20Z,east,B,59.25
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,my-result,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:40Z,east,C,52.62
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,,0,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:40Z,east,C,52.62
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,my-result,1,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:00Z,west,A,62.73
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,,1,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:00Z,west,A,62.73
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,my-result,1,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:20Z,west,B,12.83
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,,1,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:20Z,west,B,12.83
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,my-result,1,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:40Z,west,C,51.62
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,,1,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:40Z,west,C,51.62
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"
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"
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csv.from(csv: csvData)
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csv.from(csv: csvData)
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```
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```
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### Valid data types
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{{% warn %}}
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Flux only supports [data types](#data-types) in the `#datatype` annotation.
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| Datatype | Flux type | Description |
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It does **does not** support [line protocol elements](#line-protocol-elements).
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| :-------- | :--------- | :---------- |
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{{% /warn %}}
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| boolean | bool | a truth value, one of "true" or "false" |
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| unsignedLong | uint | an unsigned 64-bit integer |
|
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| long | int | a signed 64-bit integer |
|
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| double | float | an IEEE-754 64-bit floating-point number |
|
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| string | string | a UTF-8 encoded string |
|
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| base64Binary | bytes | a base64 encoded sequence of bytes as defined in RFC 4648 |
|
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| dateTime | time | an instant in time, may be followed with a colon : and a description of the format |
|
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| duration | duration | a length of time represented as an unsigned 64-bit integer number of nanoseconds |
|
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## Errors
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## Errors
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@ -218,7 +291,7 @@ If an error occurs:
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Encoding for an error with the datatype annotation:
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Encoding for an error with the datatype annotation:
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```csv
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```
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#datatype,string,long
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#datatype,string,long
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,error,reference
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,error,reference
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,Failed to parse query,897
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,Failed to parse query,897
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@ -226,7 +299,7 @@ Encoding for an error with the datatype annotation:
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Encoding for an error that occurs after a valid table has been encoded:
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Encoding for an error that occurs after a valid table has been encoded:
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```csv
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```
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#datatype,string,long,dateTime:RFC3339,dateTime:RFC3339,dateTime:RFC3339,string,string,double
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#datatype,string,long,dateTime:RFC3339,dateTime:RFC3339,dateTime:RFC3339,string,string,double
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,result,table,_start,_stop,_time,region,host,_value
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,result,table,_start,_stop,_time,region,host,_value
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,my-result,1,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:00Z,west,A,62.73
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,my-result,1,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:00Z,west,A,62.73
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@ -234,7 +307,7 @@ Encoding for an error that occurs after a valid table has been encoded:
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,my-result,1,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:40Z,west,C,51.62
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,my-result,1,2018-05-08T20:50:00Z,2018-05-08T20:51:00Z,2018-05-08T20:50:40Z,west,C,51.62
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||||||
```
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```
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|
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```csv
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```
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#datatype,string,long
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#datatype,string,long
|
||||||
,error,reference,query terminated: reached maximum allowed memory limits,576
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,error,reference,query terminated: reached maximum allowed memory limits,576
|
||||||
```
|
```
|
||||||
|
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||||||
Loading…
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