Document DICTIONARY AND RLE encodings in SerializedPage Wire Format

prestodb · Sep 22, 2023 · 9ed0fc2 · 9ed0fc2
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commit 9ed0fc2
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diff --git a/presto-docs/src/main/sphinx/develop/serialized-page.rst b/presto-docs/src/main/sphinx/develop/serialized-page.rst
@@ -212,6 +212,20 @@ from the null flags.
 .. image:: serialized-page-row-column.png
   :width: 600
 
+DICTIONARY Encoding
+-------------------
+
+* Number of rows - 4 bytes
+* Dictionary values column. This column itself is a serialized block whose encoding can be any of the encodings mentioned in this document.
+* Indices - number of rows * 4 bytes; 4 bytes per index
+* Dictionary ID - 24 bytes
+
+RLE Encoding
+------------
+
+* Number of rows - 4 bytes
+* Single-row constant value column
+
 Additional Usage
 ----------------