/**
* Get Map of ExprNodeColumnDesc HashCode to ExprNodeColumnDesc.
*
* @param exprDesc
* @param hashCodeToColumnDescMap Assumption: If two ExprNodeColumnDesc have same hash code then
* they are logically referring to same projection
*/
public static void getExprNodeColumnDesc(
ExprNodeDesc exprDesc, Map<Integer, ExprNodeDesc> hashCodeToColumnDescMap) {
if (exprDesc instanceof ExprNodeColumnDesc) {
hashCodeToColumnDescMap.put(exprDesc.hashCode(), exprDesc);
} else if (exprDesc instanceof ExprNodeColumnListDesc) {
for (ExprNodeDesc child : exprDesc.getChildren()) {
getExprNodeColumnDesc(child, hashCodeToColumnDescMap);
}
} else if (exprDesc instanceof ExprNodeGenericFuncDesc) {
for (ExprNodeDesc child : exprDesc.getChildren()) {
getExprNodeColumnDesc(child, hashCodeToColumnDescMap);
}
} else if (exprDesc instanceof ExprNodeFieldDesc) {
getExprNodeColumnDesc(((ExprNodeFieldDesc) exprDesc).getDesc(), hashCodeToColumnDescMap);
}
}
public static void getExprNodeColumnDesc(
List<ExprNodeDesc> exprDescList, Map<Integer, ExprNodeDesc> hashCodeTocolumnDescMap) {
for (ExprNodeDesc exprNodeDesc : exprDescList) {
getExprNodeColumnDesc(exprNodeDesc, hashCodeTocolumnDescMap);
}
}