Github user JamesRTaylor commented on a diff in the pull request:
https://github.com/apache/phoenix/pull/75#discussion_r28934572
--- Diff:
phoenix-core/src/main/java/org/apache/phoenix/schema/types/PJsonDataType.java
---
@@ -0,0 +1,258 @@
+package org.apache.phoenix.schema.types;
+
+import java.io.IOException;
+import java.sql.Types;
+import java.text.Format;
+
+import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
+import org.apache.hadoop.hbase.util.Bytes;
+import org.apache.phoenix.exception.SQLExceptionCode;
+import org.apache.phoenix.exception.SQLExceptionInfo;
+import org.apache.phoenix.schema.IllegalDataException;
+import org.apache.phoenix.schema.SortOrder;
+import org.apache.phoenix.schema.json.PhoenixJson;
+import org.apache.phoenix.util.ByteUtil;
+import org.apache.phoenix.util.StringUtil;
+import org.codehaus.jackson.JsonParseException;
+
+import com.google.common.base.Preconditions;
+
+/**
+ * <p>
+ * A Phoenix data type to represent JSON. The json data type stores an
exact
+ * copy of the input text, which processing functions must reparse on each
+ * execution. Because the json type stores an exact copy of the input
text, it
+ * will preserve semantically-insignificant white space between tokens, as
well
+ * as the order of keys within JSON objects. Also, if a JSON object within
the
+ * value contains the same key more than once, all the key/value pairs are
kept.
+ * It stores the data as string in single column of HBase and it has same
data
+ * size limit as Phoenix's Varchar.
+ * <p>
+ * JSON data types are for storing JSON (JavaScript Object Notation) data,
as
+ * specified in RFC 7159. Such data can also be stored as text, but the
JSON
+ * data types have the advantage of enforcing that each stored value is
valid
+ * according to the JSON rules.
+ */
+public class PJsonDataType extends PDataType<String> {
--- End diff --
Did you consider deriving from PVarchar?
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