private Column undeclaredHKeyColumn(HKeyColumn hKeyColumn) {
Column undeclaredHKeyColumn = null;
int rootMostDepth = rootMostTable().getDepth();
List<Column> equivalentColumns = hKeyColumn.equivalentColumns();
switch (getJoinType()) {
case LEFT:
// use a rootward bias, but no more rootward than the rootmost table
for (Column equivalentColumn : equivalentColumns) {
int equivalentColumnDepth = equivalentColumn.getTable().getDepth();
if (undeclaredHKeyColumn == null && equivalentColumnDepth >= rootMostDepth) {
undeclaredHKeyColumn = equivalentColumn;
}
}
break;
case RIGHT:
// use a leafward bias, but no more leafward than the leafdmost table
int leafMostDepth = leafMostTable().getDepth();
for (ListIterator<Column> reverseCols =
equivalentColumns.listIterator(equivalentColumns.size());
reverseCols.hasPrevious(); ) {
Column equivalentColumn = reverseCols.previous();
int equivalentColumnDepth = equivalentColumn.getTable().getDepth();
if (undeclaredHKeyColumn == null && equivalentColumnDepth <= leafMostDepth) {
undeclaredHKeyColumn = equivalentColumn;
}
}
break;
}
if (undeclaredHKeyColumn == null) {
undeclaredHKeyColumn = hKeyColumn.column();
}
return undeclaredHKeyColumn;
}
private static int columnPosition(
Map<? extends Table, Integer> flattenedRowOffsets, Column column) {
int position = column.getPosition();
Integer offset = flattenedRowOffsets.get(column.getTable());
if (offset == null) {
throw new NullPointerException(
"no offset for " + column.getTable() + " in " + flattenedRowOffsets);
}
position += offset;
return position;
}
public void markInvolvedInIndex(Column column) {
assert column.getTable() == table;
inIndex.set(column.getPosition(), true);
}
private int depth(Column column) {
return column.getTable().getDepth();
}
