Reject negative precision

h2/src/main/org/h2/command/Parser.java

@@ -4146,6 +4146,14 @@ public class Parser {
         return i;
     }
 
+    private long readNonNegativeLong() {
+        long v = readLong();
+        if (v < 0) {
+            throw DbException.getInvalidValueException("non-negative long", v);
+        }
+        return v;
+    }
+
     private long readLong() {
         boolean minus = false;
         if (currentTokenType == MINUS_SIGN) {
@@ -5302,7 +5310,7 @@ public class Parser {
                 }
             } else if (readIf(OPEN_PAREN)) {
                 if (!readIf("MAX")) {
-                    long p = readLong();
+                    long p = readNonNegativeLong();
                     if (readIf("K")) {
                         p *= 1024;
                     } else if (readIf("M")) {

h2/src/test/org/h2/test/scripts/datatypes/decimal.sql

@@ -2,3 +2,9 @@
 -- and the EPL 1.0 (http://h2database.com/html/license.html).
 -- Initial Developer: H2 Group
 --
+
+CREATE TABLE TEST(I NUMERIC(-1));
+> exception INVALID_VALUE_2
+
+CREATE TABLE TEST(I NUMERIC(-1, -1));
+> exception INVALID_VALUE_2