Small improvements.

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

@@ -317,7 +317,7 @@ public abstract class Expression {
     public static Expression[] getExpressionColumns(Session session, ValueArray value) {
         Value[] list = value.getList();
         ExpressionColumn[] expr = new ExpressionColumn[list.length];
-        for (int i = 0; i < list.length; i++) {
+        for (int i = 0, len = list.length; i < len; i++) {
             Value v = list[i];
             Column col = new Column("C" + (i + 1), v.getType(), v.getPrecision(), v.getScale(),
                     v.getDisplaySize());

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

@@ -99,16 +99,17 @@ public class JavaAggregate extends Expression {
     }
 
     public void mapColumns(ColumnResolver resolver, int level) {
-        for (int i = 0; i < args.length; i++) {
-            args[i].mapColumns(resolver, level);
+        for (Expression arg : args) {
+            arg.mapColumns(resolver, level);
         }
     }
 
     public Expression optimize(Session session) {
         userConnection = session.createConnection(false);
-        argTypes = new int[args.length];
-        int[] argSqlTypes = new int[args.length];
-        for (int i = 0; i < args.length; i++) {
+        int len = args.length;
+        argTypes = new int[len];
+        int[] argSqlTypes = new int[len];
+        for (int i = 0; i < len; i++) {
             Expression expr = args[i];
             args[i] = expr.optimize(session);
             int type = expr.getType();
@@ -178,7 +179,7 @@ public class JavaAggregate extends Expression {
             }
             Object[] argValues = new Object[args.length];
             Object arg = null;
-            for (int i = 0; i < args.length; i++) {
+            for (int i = 0, len = args.length; i < len; i++) {
                 Value v = args[i].getValue(session);
                 v = v.convertTo(argTypes[i]);
                 arg = v.getObject();

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

@@ -53,7 +53,7 @@ public class JavaFunction extends Expression implements FunctionCall {
 
     public Expression optimize(Session session) {
         boolean allConst = isDeterministic();
-        for (int i = 0; i < args.length; i++) {
+        for (int i = 0, len = args.length; i < len; i++) {
             Expression e = args[i].optimize(session);
             args[i] = e;
             allConst &= e.isConstant();
@@ -160,9 +160,9 @@ public class JavaFunction extends Expression implements FunctionCall {
     public Expression[] getExpressionColumns(Session session) {
         switch (getType()) {
         case Value.RESULT_SET:
-            ValueResultSet vrs = getValueForColumnList(session, getArgs());
+            ValueResultSet rs = getValueForColumnList(session, getArgs());
             try {
-                return getExpressionColumns(session, vrs.getResultSet());
+                return getExpressionColumns(session, rs.getResultSet());
             } catch (SQLException e) {
                 throw DbException.convert(e);
             }

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

@@ -96,14 +96,14 @@ public class Subquery extends Expression {
 
     private Expression getExpression() {
         if (expression == null) {
-            ArrayList<Expression> exprs = query.getExpressions();
+            ArrayList<Expression> expressions = query.getExpressions();
             int columnCount = query.getColumnCount();
             if (columnCount == 1) {
-                expression = exprs.get(0);
+                expression = expressions.get(0);
             } else {
                 Expression[] list = new Expression[columnCount];
                 for (int i = 0; i < columnCount; i++) {
-                    list[i] = exprs.get(i);
+                    list[i] = expressions.get(i);
                 }
                 expression = new ExpressionList(list);
             }

h2/src/main/org/h2/fulltext/FullText.java

@@ -961,8 +961,7 @@ public class FullText {
 
         private int[] getWordIds(Object[] row) throws SQLException {
             HashSet<String> words = New.hashSet();
-            for (int i = 0; i < index.indexColumns.length; i++) {
-                int idx = index.indexColumns[i];
+            for (int idx : index.indexColumns) {
                 int type = columnTypes[idx];
                 Object data = row[idx];
                 if (type == Types.CLOB && data != null) {

h2/src/main/org/h2/fulltext/FullTextLucene.java

@@ -430,8 +430,9 @@ public class FullTextLucene extends FullText {
             if (limit == 0) {
                 limit = docs.totalHits;
             }
-            for (int i = 0; i < limit && i + offset < docs.totalHits
-                    && i + offset < docs.scoreDocs.length; i++) {
+            for (int i = 0, len = docs.scoreDocs.length;
+                    i < limit && i + offset < docs.totalHits
+                    && i + offset < len; i++) {
                 ScoreDoc sd = docs.scoreDocs[i + offset];
                 Document doc = searcher.doc(sd.doc);
                 float score = sd.score;