Fixed code style.

Author: vldpyatkov

modules/calcite/src/main/java/org/apache/ignite/internal/processors/query/calcite/rule/logical/IgniteLogicalWindowRewriteRule.java

@@ -109,16 +109,16 @@ private IgniteLogicalWindowRewriteRule(Config config) {
             aggCalls.add(toAggregateCall(winAggCall, typeFactory));
         }
 
-        ImmutableBitSet groupSet = grp.keys;
+        ImmutableBitSet grpSet = grp.keys;
 
         RelNode agg = LogicalAggregate.create(
             input,
-            groupSet,
+            grpSet,
             null,
             aggCalls
         );
 
-        RexNode condition = buildPartitionJoinCondition(rexBuilder, typeFactory, input, agg, groupSet);
+        RexNode condition = buildPartitionJoinCondition(rexBuilder, typeFactory, input, agg, grpSet);
 
         RelNode join = LogicalJoin.create(
             input,
@@ -281,7 +281,7 @@ private static AggregateCall toAggregateCall(
             .map(RexNode::getType)
             .collect(Collectors.toList());
 
-        SqlAggFunction agg = (SqlAggFunction) winAggCall.getOperator();
+        SqlAggFunction agg = (SqlAggFunction)winAggCall.getOperator();
 
         SqlOperatorBinding binding = new ExplicitOperatorBinding(typeFactory, agg, operandTypes);
 
@@ -313,7 +313,7 @@ private static List<RexNode> buildProjection(RelNode join, LogicalWindow win, Lo
         RexBuilder rexBuilder = win.getCluster().getRexBuilder();
         int inputFieldCnt = win.getInput().getRowType().getFieldCount();
 
-        int groupKeyCnt = grp.keys.cardinality();
+        int grpKeyCnt = grp.keys.cardinality();
         int aggFieldCnt = grp.aggCalls.size();
 
         List<RexNode> projects = new ArrayList<>(inputFieldCnt + aggFieldCnt);
@@ -322,7 +322,7 @@ private static List<RexNode> buildProjection(RelNode join, LogicalWindow win, Lo
             projects.add(rexBuilder.makeInputRef(join, i));
 
         for (int i = 0; i < aggFieldCnt; i++) {
-            RexNode ref = rexBuilder.makeInputRef(join, inputFieldCnt + groupKeyCnt + i);
+            RexNode ref = rexBuilder.makeInputRef(join, inputFieldCnt + grpKeyCnt + i);
 
             RelDataType targetType = windowAggType(win, i);