gobblin-modules/gobblin-parquet/src/main/java/org/apache/gobblin/converter/parquet/JsonElementConversionFactory.java [464:479]:
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    protected Type buildSchema() {
      JsonElementConverter elementConverter = this.elementConverter;
      JsonElementConverter keyConverter = getKeyConverter();
      GroupType mapGroup =
          Types.repeatedGroup().addFields(keyConverter.schema(), elementConverter.schema()).named(MAP_KEY)
              .asGroupType();
      String columnName = this.jsonSchema.getColumnName();
      switch (optionalOrRequired(this.jsonSchema)) {
        case OPTIONAL:
          return Types.optionalGroup().addFields(mapGroup).named(columnName).asGroupType();
        case REQUIRED:
          return Types.requiredGroup().addFields(mapGroup).named(columnName).asGroupType();
        default:
          return null;
      }
    }
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gobblin-modules/gobblin-parquet-apache/src/main/java/org/apache/gobblin/converter/parquet/JsonElementConversionFactory.java [464:479]:
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    protected Type buildSchema() {
      JsonElementConverter elementConverter = this.elementConverter;
      JsonElementConverter keyConverter = getKeyConverter();
      GroupType mapGroup =
          Types.repeatedGroup().addFields(keyConverter.schema(), elementConverter.schema()).named(MAP_KEY)
              .asGroupType();
      String columnName = this.jsonSchema.getColumnName();
      switch (optionalOrRequired(this.jsonSchema)) {
        case OPTIONAL:
          return Types.optionalGroup().addFields(mapGroup).named(columnName).asGroupType();
        case REQUIRED:
          return Types.requiredGroup().addFields(mapGroup).named(columnName).asGroupType();
        default:
          return null;
      }
    }
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