Spark Row to JSON

Question

I would like to create a JSON from a Spark v.1.6 (using scala) dataframe. I know that there is the simple solution of doing df.toJSON.

However, my probl

Answer 1

Here, no JSON parser, and it adapts to your schema:

import org.apache.spark.sql.functions.{col, concat, concat_ws, lit}

df.select(
  col(df.columns(0)),
  col(df.columns(1)),
  concat(
    lit("{"), 
    concat_ws(",",df.dtypes.slice(2, df.dtypes.length).map(dt => {
      val c = dt._1;
      val t = dt._2;
      concat(
        lit("\"" + c + "\":" + (if (t == "StringType") "\""; else "")  ),
        col(c),
        lit(if(t=="StringType") "\""; else "") 
      )
    }):_*), 
    lit("}")
  ) as "C"
).collect()