Parenthesis balance rule

[vlsi]

Samples of undesired code:

    if (!(group.isRows || (group.upperBound.isUnbounded()
        && group.lowerBound.isUnbounded()))) {

    builder.addRuleCollection(ImmutableList.of((RelOptRule) SubQueryRemoveRule.FILTER,
        SubQueryRemoveRule.PROJECT,
        SubQueryRemoveRule.JOIN));

      if (((nlsString.getCharset() != null
          && type.getCharset().equals(nlsString.getCharset()))
          || (nlsString.getCharset() == null
          && SqlCollation.IMPLICIT.getCharset().equals(type.getCharset())))
          && nlsString.getCollation().equals(type.getCollation())
          && ((NlsString) value).getValue().length() == type.getPrecision()) {
        includeType = RexDigestIncludeType.NO_TYPE;
      } else {
        includeType = RexDigestIncludeType.ALWAYS;
      }

    if ((leftRowCount != null)
        && (rightRowCount != null)
        && ((leftRowCount < rightRowCount)
        || ((Math.abs(leftRowCount - rightRowCount)
        < RelOptUtil.EPSILON)
        && (rowWidthCost(left.getJoinTree())
        < rowWidthCost(right.getJoinTree()))))) {
      swap = true;
    }

        literals.add((RexLiteral) rexBuilder.makeLiteral(
            BigDecimal.ZERO, aggregateCall.getType(), false));

    Object expr4 =
        gt(
            qw(42, 43), eq(gt(x,
                y), 2));

    Object expr = gt(eq(x, 2+(3)
      ), 5);

    Object expr2 = "(" + gt(eq(x, (3)+2
      ), 6);

    Object expr3 =
        gt(
            qw(), eq(gt(x,
                y), 2));