davisusanibar commented on code in PR #215:
URL: https://github.com/apache/arrow-cookbook/pull/215#discussion_r880858576
##########
java/source/create.rst:
##########
@@ -70,6 +70,62 @@ Array of Varchar
[one, two, three]
+In some scenarios could be more appropriate use `Dictionary-encoded Layout`_
to encoded data which takes much less space.
+
+.. testcode::
+
+ import org.apache.arrow.memory.BufferAllocator;
+ import org.apache.arrow.memory.RootAllocator;
+ import org.apache.arrow.vector.FieldVector;
+ import org.apache.arrow.vector.VarCharVector;
+ import org.apache.arrow.vector.dictionary.Dictionary;
+ import org.apache.arrow.vector.dictionary.DictionaryEncoder;
+ import org.apache.arrow.vector.types.pojo.DictionaryEncoding;
+
+ import java.nio.charset.StandardCharsets;
+
+ try (BufferAllocator root = new RootAllocator();
+ VarCharVector countries = new VarCharVector("country-dict", root);
+ VarCharVector myAppUseCountryDictionary = new
VarCharVector("app-use-country-dict", root)
Review Comment:
Changed
##########
java/source/create.rst:
##########
@@ -70,6 +70,62 @@ Array of Varchar
[one, two, three]
+In some scenarios could be more appropriate use `Dictionary-encoded Layout`_
to encoded data which takes much less space.
+
+.. testcode::
+
+ import org.apache.arrow.memory.BufferAllocator;
+ import org.apache.arrow.memory.RootAllocator;
+ import org.apache.arrow.vector.FieldVector;
+ import org.apache.arrow.vector.VarCharVector;
+ import org.apache.arrow.vector.dictionary.Dictionary;
+ import org.apache.arrow.vector.dictionary.DictionaryEncoder;
+ import org.apache.arrow.vector.types.pojo.DictionaryEncoding;
+
+ import java.nio.charset.StandardCharsets;
+
+ try (BufferAllocator root = new RootAllocator();
+ VarCharVector countries = new VarCharVector("country-dict", root);
+ VarCharVector myAppUseCountryDictionary = new
VarCharVector("app-use-country-dict", root)
+ ) {
+ countries.allocateNew(10);
+ countries.set(0, "Andorra".getBytes(StandardCharsets.UTF_8));
+ countries.set(1, "Cuba".getBytes(StandardCharsets.UTF_8));
+ countries.set(2, "Grecia".getBytes(StandardCharsets.UTF_8));
+ countries.set(3, "Guinea".getBytes(StandardCharsets.UTF_8));
+ countries.set(4, "Islandia".getBytes(StandardCharsets.UTF_8));
+ countries.set(5, "Malta".getBytes(StandardCharsets.UTF_8));
+ countries.set(6, "Tailandia".getBytes(StandardCharsets.UTF_8));
+ countries.set(7, "Uganda".getBytes(StandardCharsets.UTF_8));
+ countries.set(8, "Yemen".getBytes(StandardCharsets.UTF_8));
+ countries.set(9, "Zambia".getBytes(StandardCharsets.UTF_8));
+ countries.setValueCount(10);
+
+ Dictionary myCountryDictionary = new Dictionary(countries,
Review Comment:
Changed
##########
java/source/create.rst:
##########
@@ -70,6 +70,62 @@ Array of Varchar
[one, two, three]
+In some scenarios could be more appropriate use `Dictionary-encoded Layout`_
to encoded data which takes much less space.
+
+.. testcode::
+
+ import org.apache.arrow.memory.BufferAllocator;
+ import org.apache.arrow.memory.RootAllocator;
+ import org.apache.arrow.vector.FieldVector;
+ import org.apache.arrow.vector.VarCharVector;
+ import org.apache.arrow.vector.dictionary.Dictionary;
+ import org.apache.arrow.vector.dictionary.DictionaryEncoder;
+ import org.apache.arrow.vector.types.pojo.DictionaryEncoding;
+
+ import java.nio.charset.StandardCharsets;
+
+ try (BufferAllocator root = new RootAllocator();
+ VarCharVector countries = new VarCharVector("country-dict", root);
+ VarCharVector myAppUseCountryDictionary = new
VarCharVector("app-use-country-dict", root)
+ ) {
+ countries.allocateNew(10);
+ countries.set(0, "Andorra".getBytes(StandardCharsets.UTF_8));
+ countries.set(1, "Cuba".getBytes(StandardCharsets.UTF_8));
+ countries.set(2, "Grecia".getBytes(StandardCharsets.UTF_8));
+ countries.set(3, "Guinea".getBytes(StandardCharsets.UTF_8));
+ countries.set(4, "Islandia".getBytes(StandardCharsets.UTF_8));
+ countries.set(5, "Malta".getBytes(StandardCharsets.UTF_8));
+ countries.set(6, "Tailandia".getBytes(StandardCharsets.UTF_8));
+ countries.set(7, "Uganda".getBytes(StandardCharsets.UTF_8));
+ countries.set(8, "Yemen".getBytes(StandardCharsets.UTF_8));
+ countries.set(9, "Zambia".getBytes(StandardCharsets.UTF_8));
+ countries.setValueCount(10);
+
+ Dictionary myCountryDictionary = new Dictionary(countries,
+ new DictionaryEncoding(/*id=*/1L, /*ordered=*/false,
/*indexType=*/null));
Review Comment:
Added
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