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cdc: add description about canal-json content-compatible (#15568) #15762

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Dec 21, 2023
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cdc: add description about canal-json content-compatible (#15568) #15762

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cdc: add description about canal-json content-compatible
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7 changes: 7 additions & 0 deletions ticdc/ticdc-canal-json.md
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Expand Up @@ -267,6 +267,13 @@ The way that TiCDC implements the Canal-JSON data format, including the `Update`
| Event of `Update` Type | By default, the `old` field contains all the column data. When `only_output_updated_columns` is `true`, the `old` field contains only the modified column data. | The `old` field contains only the modified column data |
| `mysqlType` field | For types with parameters, it does not contain the information of the type parameter | For types with parameters, it contains the full information of the type parameter |

### Compatibility with the official Canal

Starting from v6.5.6, TiCDC Canal-JSON supports compatibility with the data format of the official Canal. When creating a changefeed, you can set `content-compatible=true` in `sink-uri` to enable this feature. In this mode, TiCDC outputs Canal-JSON format data that is compatible with the official Canal. The specific changes are as follows:
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* The `mysqlType` field contains the full information of the type parameter for each type.
* An Event of `Update` Type only outputs the modified column data.
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### Event of `Update` Type

For an Event of `Update` Type:
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