How to use

getSourceField

method

in

org.apache.calcite.rex.RexProgram

/**
 * Returns whether this program is a permutation of its inputs.
 */
public boolean isPermutation() {
 if (projects.size() != inputRowType.getFieldList().size()) {
  return false;
 }
 for (int i = 0; i < projects.size(); ++i) {
  if (getSourceField(i) < 0) {
   return false;
  }
 }
 return true;
}

/**
 * Returns whether this program is a permutation of its inputs.
 */
public boolean isPermutation() {
 if (projects.size() != inputRowType.getFieldList().size()) {
  return false;
 }
 for (int i = 0; i < projects.size(); ++i) {
  if (getSourceField(i) < 0) {
   return false;
  }
 }
 return true;
}

/**
 * Returns a permutation, if this program is a permutation, otherwise null.
 */
public Permutation getPermutation() {
 Permutation permutation = new Permutation(projects.size());
 if (projects.size() != inputRowType.getFieldList().size()) {
  return null;
 }
 for (int i = 0; i < projects.size(); ++i) {
  int sourceField = getSourceField(i);
  if (sourceField < 0) {
   return null;
  }
  permutation.set(i, sourceField);
 }
 return permutation;
}

/**
 * Returns a permutation, if this program is a permutation, otherwise null.
 */
public Permutation getPermutation() {
 Permutation permutation = new Permutation(projects.size());
 if (projects.size() != inputRowType.getFieldList().size()) {
  return null;
 }
 for (int i = 0; i < projects.size(); ++i) {
  int sourceField = getSourceField(i);
  if (sourceField < 0) {
   return null;
  }
  permutation.set(i, sourceField);
 }
 return permutation;
}