Initial commit, prohibiting empty predicate for IN clause.

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

@@ -2176,6 +2176,9 @@ public class Parser {
             } else if (readIf("IN")) {
                 read("(");
                 if (readIf(")")) {
+                    if (database.getMode().prohibitEmptyInPredicate) {
+                        throw getSyntaxError();
+                    }
                     r = ValueExpression.get(ValueBoolean.get(false));
                 } else {
                     if (isSelect()) {

h2/src/main/org/h2/engine/Mode.java

@@ -150,6 +150,8 @@ public class Mode {
      */
     public boolean supportPoundSymbolForColumnNames;
 
+    public boolean prohibitEmptyInPredicate;
+
     private final String name;
 
     static {
@@ -168,6 +170,7 @@ public class Mode {
         mode.supportedClientInfoPropertiesRegEx =
                 Pattern.compile("ApplicationName|ClientAccountingInformation|" +
                         "ClientUser|ClientCorrelationToken");
+        mode.prohibitEmptyInPredicate = true;
         add(mode);
 
         mode = new Mode("Derby");
@@ -216,6 +219,7 @@ public class Mode {
         //     JDBC4CommentClientInfoProvider.java
         mode.supportedClientInfoPropertiesRegEx =
                 Pattern.compile(".*");
+        mode.prohibitEmptyInPredicate = true;
         add(mode);
 
         mode = new Mode("Oracle");
@@ -228,6 +232,7 @@ public class Mode {
         // https://docs.oracle.com/database/121/JJDBC/jdbcvers.htm#JJDBC29006
         mode.supportedClientInfoPropertiesRegEx =
                 Pattern.compile(".*\\..*");
+        mode.prohibitEmptyInPredicate = true;
         add(mode);
 
         mode = new Mode("PostgreSQL");
@@ -242,6 +247,7 @@ public class Mode {
         //     org/postgresql/jdbc4/AbstractJdbc4Connection.java
         mode.supportedClientInfoPropertiesRegEx =
                 Pattern.compile("ApplicationName");
+        mode.prohibitEmptyInPredicate = true;
         add(mode);
     }
 

h2/src/test/org/h2/test/db/TestCompatibility.java

@@ -218,6 +218,11 @@ public class TestCompatibility extends TestBase {
         prep.setInt(1, 2);
         prep.executeQuery();
         stat.execute("DROP TABLE TEST IF EXISTS");
+
+        stat.execute("DROP TABLE TEST IF EXISTS");
+        stat.execute("CREATE TABLE TEST(ID INT)");
+        stat.executeQuery("SELECT * FROM TEST WHERE ID IN ()");
+        stat.execute("DROP TABLE TEST IF EXISTS");
     }
 
     private void testLog(double expected, Statement stat) throws SQLException {

h2/src/test/org/h2/test/db/TestCompatibilityOracle.java

@@ -37,6 +37,7 @@ public class TestCompatibilityOracle extends TestBase {
         testDecimalScale();
         testPoundSymbolInColumnName();
         testToDate();
+        testForbidEmptyInClause();
     }
 
     private void testTreatEmptyStringsAsNull() throws SQLException {
@@ -161,6 +162,22 @@ public class TestCompatibilityOracle extends TestBase {
         conn.close();
     }
 
+    private void testForbidEmptyInClause() throws SQLException {
+        deleteDb("oracle");
+        Connection conn = getConnection("oracle;MODE=Oracle");
+        Statement stat = conn.createStatement();
+
+        stat.execute("CREATE TABLE A (ID NUMBER, X VARCHAR2(1))");
+        try {
+            stat.executeQuery("SELECT * FROM A WHERE ID IN ()");
+            fail();
+        }
+        catch (SQLException e) {
+        } finally {
+            conn.close();
+        }
+    }
+
     private void assertResultDate(String expected, Statement stat, String sql)
             throws SQLException {
         SimpleDateFormat iso8601 = new SimpleDateFormat(