Improved PostgreSQL compatibility: support for RANDOM() in addition to RAND().

h2/src/docsrc/help/help.csv

@@ -2613,7 +2613,7 @@ POWER(A, B)
 "
 
 "Functions (Numeric)","RAND","
-RAND( [ int ] )
+{ RAND | RANDOM } ( [ int ] )
 ","
 Calling the function without parameter returns the next a pseudo random number.
 Calling it with an parameter seeds the session's random number generator.

h2/src/docsrc/html/changelog.html

@@ -17,7 +17,8 @@ Change Log
 
 <h1>Change Log</h1>
 <h2>Next Version (unreleased)</h2>
-<ul><li>There was a classloader memory leak problem because a class contained a static
+<ul><li>Improved PostgreSQL compatibility: support for RANDOM() in addition to RAND().
+</li><li>There was a classloader memory leak problem because a class contained a static
     references to an exception (including stack trace).
 </li><li>Split file system: truncating a file now deletes the parts in reverse order,
     so that the file list is consistent if the process is interrupted while truncating.

h2/src/main/org/h2/expression/Function.java

@@ -179,6 +179,7 @@ public class Function extends Expression implements FunctionCall {
         // RAND without argument: get the next value
         // RAND with one argument: seed the random generator
         addFunctionNotDeterministic("RAND", RAND, VAR_ARGS, Value.DOUBLE);
+        addFunctionNotDeterministic("RANDOM", RAND, VAR_ARGS, Value.DOUBLE);
         addFunction("ROUND", ROUND, 2, Value.DOUBLE);
         addFunction("ROUNDMAGIC", ROUNDMAGIC, 1, Value.DOUBLE);
         addFunction("SIGN", SIGN, 1, Value.INT);

h2/src/test/org/h2/test/test-1.3.txt

@@ -9003,16 +9003,16 @@ select power(null, null) en, power(2, 3) e8, power(16, 0.5) e4 from test;
 SET AUTOCOMMIT FALSE;
 > ok
 
-select rand(1) e from test;
-> E
-> ------------------
-> 0.7308781907032909
+select rand(1) e, random() f from test;
+> E                  F
+> ------------------ -------------------
+> 0.7308781907032909 0.41008081149220166
 > rows: 1
 
 select rand() e from test;
 > E
 > -------------------
-> 0.41008081149220166
+> 0.20771484130971707
 > rows: 1
 
 SET AUTOCOMMIT TRUE;