parquet-avro/src/main/java/org/apache/parquet/avro/AvroIndexedRecordConverter.java [501:530]:
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        Type valueType = keyValueType.getType(1);
        Schema nonNullValueSchema = AvroSchemaConverter.getNonNull(mapSchema.getValueType());
        valueConverter = newConverter(nonNullValueSchema, valueType, model, new ParentValueContainer() {
          @Override
          @SuppressWarnings("unchecked")
          public void add(Object value) {
            MapKeyValueConverter.this.value = (V) value;
          }
        });
      }

      @Override
      public Converter getConverter(int fieldIndex) {
        if (fieldIndex == 0) {
          return keyConverter;
        } else if (fieldIndex == 1) {
          return valueConverter;
        }
        throw new IllegalArgumentException("only the key (0) and value (1) fields expected: " + fieldIndex);
      }

      @Override
      public void start() {
        key = null;
        value = null;
      }

      @Override
      public void end() {
        map.put(key, value);
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parquet-avro/src/main/java/org/apache/parquet/avro/AvroRecordConverter.java [1060:1089]:
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        Type valueType = keyValueType.getType(1);
        Schema nonNullValueSchema = AvroSchemaConverter.getNonNull(mapSchema.getValueType());
        valueConverter = newConverter(nonNullValueSchema, valueType, model, new ParentValueContainer() {
          @Override
          @SuppressWarnings("unchecked")
          public void add(Object value) {
            MapKeyValueConverter.this.value = (V) value;
          }
        });
      }

      @Override
      public Converter getConverter(int fieldIndex) {
        if (fieldIndex == 0) {
          return keyConverter;
        } else if (fieldIndex == 1) {
          return valueConverter;
        }
        throw new IllegalArgumentException("only the key (0) and value (1) fields expected: " + fieldIndex);
      }

      @Override
      public void start() {
        key = null;
        value = null;
      }

      @Override
      public void end() {
        map.put(key, value);
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