Github user hmcl commented on a diff in the pull request:
https://github.com/apache/storm/pull/931#discussion_r48886268
--- Diff: documentation/storm-sql-internal.md ---
@@ -0,0 +1,55 @@
+---
+title: The Internals of Storm SQL
+layout: documentation
+documentation: true
+---
+
+This page describes the design and the implementation of the Storm SQL
integration.
+
+## Overview
+
+SQL is a well-adopted yet complicated standard. Several projects including
Drill, Hive, Phoenix and Spark have invested significantly in their SQL layers.
One of the main design goal of StormSQL is to leverage the existing investments
for these projects. StormSQL leverages [Apache Calcite](///calcite.apache.org)
to implement the SQL standard. StormSQL focuses on compiling the SQL statements
to Storm / Trident topologies so that they can be executed in Storm clusters.
--- End diff --
design goals
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