[jira] [Assigned] (SPARK-42690) Implement CSV/JSON parsing funcions

["Apache Spark (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-42690?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-42690:
------------------------------------

    Assignee: Apache Spark

> Implement CSV/JSON parsing funcions
> -----------------------------------
>
>                 Key: SPARK-42690
>                 URL: https://issues.apache.org/jira/browse/SPARK-42690
>             Project: Spark
>          Issue Type: New Feature
>          Components: Connect
>    Affects Versions: 3.4.0
>            Reporter: Herman van Hövell
>            Assignee: Apache Spark
>            Priority: Major
>
> Implement the following two methods in DataFrameReader:
>  
>  
> {code:java}
> /**
> * Loads a `Dataset[String]` storing JSON objects (<a href="http://jsonlines.org/">JSON Lines
> * text format or newline-delimited JSON</a>) and returns the result as a `DataFrame`.
> *
> * Unless the schema is specified using `schema` function, this function goes through the
> * input once to determine the input schema.
> *
> * @param jsonDataset input Dataset with one JSON object per record
> * @since 3.4.0
> */
> def json(jsonDataset: Dataset[String]): DataFrame
> /**
> * Loads an `Dataset[String]` storing CSV rows and returns the result as a `DataFrame`.
> *
> * If the schema is not specified using `schema` function and `inferSchema` option is enabled,
> * this function goes through the input once to determine the input schema.
> *
> * If the schema is not specified using `schema` function and `inferSchema` option is disabled,
> * it determines the columns as string types and it reads only the first line to determine the
> * names and the number of fields.
> *
> * If the enforceSchema is set to `false`, only the CSV header in the first line is checked
> * to conform specified or inferred schema.
> *
> * @note if `header` option is set to `true` when calling this API, all lines same with
> * the header will be removed if exists.
> *
> * @param csvDataset input Dataset with one CSV row per record
> * @since 3.4.0
> */
> def csv(csvDataset: Dataset[String]): DataFrame
> {code}
>  
> For this we need a new message. We cannot use project because we don't know the schema upfront.
>  
> {code:java}
> message Parse {
>   // (Required) Input relation to Parse. The input is expected to have single text column.
>   Relation input = 1;
>   // (Required) The expected format of the text.
>   ParseFormat format = 2;
>   enum ParseFormat {
>     PARSE_FORMAT_UNSPECIFIED = 0;
>     PARSE_FORMAT_CSV = 1;
>     PARSE_FORMAT_JSON = 2;
>   }
> }
> {code}
>  
>  



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