Support for the function LN (an alias for LOG).

h2/src/docsrc/help/help.csv

@@ -2534,7 +2534,7 @@ MOD(A, B)
 See also Java ""Math.ceil"".
 This method returns a double.
 ","
-LOG(A)
+CEIL(A)
 "
 
 "Functions (Numeric)","DEGREES","
@@ -2565,7 +2565,7 @@ FLOOR(A)
 "
 
 "Functions (Numeric)","LOG","
-LOG(double)
+{ LOG | LN } (double)
 ","
 See also Java ""Math.log"".
 This method returns a double.

h2/src/docsrc/html/changelog.html

@@ -17,7 +17,8 @@ Change Log
 
 <h1>Change Log</h1>
 <h2>Next Version (unreleased)</h2>
-<ul><li>Support for the function CEIL (an alias for CEILING).
+<ul><li>Support for the function LN (an alias for LOG).
+</li><li>Support for the function CEIL (an alias for CEILING).
 </li><li>Issue 315: Access to LOBs could cause a Java level deadlock.
 </li><li>Support for the ICU4J collator.
 </li><li>Improved Oracle compatibility: support for NVL2. Thanks to litailang for the patch!

h2/src/docsrc/html/roadmap.html

@@ -534,6 +534,7 @@ See also <a href="build.html#providing_patches">Providing Patches</a>.
 </li><li>Column compression option - see http://groups.google.com/group/h2-database/browse_thread/thread/3e223504e52671fa/243da82244343f5d
 </li><li>PostgreSQL compatibility: ALTER TABLE ADD combined with adding a foreign key constraint, as in ALTER TABLE FOO ADD COLUMN PARENT BIGINT REFERENCES FOO(ID).
 </li><li>MS SQL Server compatibility: support @@ROWCOUNT.
+</li><li>PostgreSQL compatibility: LOG(x) is LOG10(x) and not LN(x).
 </li></ul>
 
 <h2>Not Planned</h2>

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

@@ -172,6 +172,7 @@ public class Function extends Expression implements FunctionCall {
         addFunction("EXP", EXP, 1, Value.DOUBLE);
         addFunction("FLOOR", FLOOR, 1, Value.DOUBLE);
         addFunction("LOG", LOG, 1, Value.DOUBLE);
+        addFunction("LN", LOG, 1, Value.DOUBLE);
         addFunction("LOG10", LOG10, 1, Value.DOUBLE);
         addFunction("MOD", MOD, 2, Value.LONG);
         addFunction("PI", PI, 0, Value.DOUBLE);

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

@@ -8946,7 +8946,7 @@ select floor(null) vn, floor(1) v1, floor(1.1) v2, floor(-1.1) v3, floor(1.9) v4
 > null 1.0 1.0 -2.0 1.0 -2.0
 > rows: 1
 
-select log(null) vn, log(1) v1, log(1.1) v2, log(-1.1) v3, log(1.9) v4, log(-1.9) v5 from test;
+select log(null) vn, log(1) v1, ln(1.1) v2, log(-1.1) v3, log(1.9) v4, log(-1.9) v5 from test;
 > VN   V1  V2                  V3  V4                 V5
 > ---- --- ------------------- --- ------------------ ---
 > null 0.0 0.09531017980432493 NaN 0.6418538861723947 NaN