davisusanibar commented on code in PR #183:
URL: https://github.com/apache/arrow-cookbook/pull/183#discussion_r848643956
##########
java/source/schema.rst:
##########
@@ -94,122 +93,135 @@ A schema is a list of Fields, where each Field is defined
by name and type.
import org.apache.arrow.vector.types.pojo.ArrowType;
import org.apache.arrow.vector.types.pojo.Field;
import org.apache.arrow.vector.types.pojo.FieldType;
+ import java.util.ArrayList;
+ import java.util.List;
Field name = new Field("name", FieldType.nullable(new ArrowType.Utf8()),
null);
- Map<String, String> metadata = new HashMap<>();
- metadata.put("A", "Id card");
- metadata.put("B", "Passport");
- metadata.put("C", "Visa");
- Field document = new Field("document", new FieldType(true, new
ArrowType.Utf8(), null, metadata), null);
+ Field document = new Field("document", new FieldType(true, new
ArrowType.Utf8(), null), null);
Field age = new Field("age", FieldType.nullable(new ArrowType.Int(32,
true)), null);
FieldType intType = new FieldType(true, new ArrowType.Int(32, true),
/*dictionary=*/null);
FieldType listType = new FieldType(true, new ArrowType.List(),
/*dictionary=*/null);
Field childField = new Field("intCol", intType, null);
List<Field> childFields = new ArrayList<>();
childFields.add(childField);
Field points = new Field("points", listType, childFields);
-
- // create a definition
Schema schemaPerson = new Schema(asList(name, document, age, points));
- System.out.print(schemaPerson)
+ System.out.print(schemaPerson);
.. testoutput::
Schema<name: Utf8, document: Utf8, age: Int(32, true), points:
List<intCol: Int(32, true)>>
+Adding Metadata for Schema
+==========================
+
+In case we need to add metadata to our definition we could use:
+
+.. testcode::
+
+ import org.apache.arrow.vector.types.pojo.Schema;
+ import static java.util.Arrays.asList;
Review Comment:
Sorted
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