Github user dyozie commented on a diff in the pull request:
https://github.com/apache/incubator-hawq-docs/pull/85#discussion_r95690934
--- Diff: markdown/reference/sql/CREATE-CAST.html.md.erb ---
@@ -0,0 +1,101 @@
+---
+title: CREATE CAST
+---
+
+Defines a new cast.
+
+## <a id="topic1__section2"></a>Synopsis
+
+``` pre
+CREATE CAST (sourcetype AS targettype)
+ WITH FUNCTION funcname (argtypes)
+ [AS ASSIGNMENT | AS IMPLICIT]
+
+CREATE CAST (sourcetype AS targettype) WITHOUT FUNCTION
+ [AS ASSIGNMENT | AS IMPLICIT]
+```
+
+## <a id="topic1__section3"></a>Description
+
+`CREATE CAST` defines a new cast. A cast specifies how to perform a
conversion between two data types. For example,
+
+```pre
+SELECT CAST(42 AS text);
+```
+
+converts the integer constant 42 to type `text` by invoking a previously
specified function, in this `case text(int4)`. If no suitable cast has been
defined, the conversion fails.
--- End diff --
Change `case text(int4)`to case `text(int4)`
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