HHH-15266 Fix NPE during function logging due to wrong character_length alternative key registration

Author: beikov

hibernate-core/src/main/java/org/hibernate/dialect/function/CommonFunctionFactory.java

@@ -1361,7 +1361,7 @@ public void length_characterLength_pattern(String clobPattern) {
 				"character_length",
 				new LengthFunction( "character_length", "character_length(?1)", clobPattern, typeConfiguration )
 		);
-		functionRegistry.registerAlternateKey( "character_length", "length" );
+		functionRegistry.registerAlternateKey( "length", "character_length" );
 	}
 
 	/**

hibernate-core/src/main/java/org/hibernate/query/sqm/function/SqmFunctionRegistry.java

@@ -292,6 +292,7 @@ public SqmFunctionDescriptor wrapInJdbcEscape(String name, SqmFunctionDescriptor
 	}
 
 	public void registerAlternateKey(String alternateKey, String mappedKey) {
+		assert functionMap.containsKey( mappedKey );
 		log.debugf( "Registering alternate key : %s -> %s", alternateKey, mappedKey );
 		alternateKeyMap.put( alternateKey, mappedKey );
 	}