/**
* This constructor is used during from AndNode during where clause evaluation to create QueryInfo
* Object
*
* @param cr ColumnReference object
* @throws StandardException
* @see AndNode#computeQueryInfo()
*/
public ColumnQueryInfo(final ColumnReference cr, QueryInfoContext qic) throws StandardException {
final ResultColumn rc = cr.getSource();
this.tableNum = cr.getTableNumber();
this.columnDescriptor = searchColumnDescriptor(rc);
if (this.columnDescriptor != null) {
this.actualColumnName = this.columnDescriptor.getColumnName();
this.actualColumnNumber = this.columnDescriptor.getPosition();
this.columnType = this.columnDescriptor.getType();
this.td = this.columnDescriptor.getTableDescriptor();
} else {
String columnName = rc.getSourceColumnName();
if (columnName == null) {
columnName = rc.getActualName();
}
this.actualColumnName = columnName;
this.actualColumnNumber = rc.getColumnPosition();
this.columnType = rc.getType();
this.td = null;
}
this.exposedColumnName = this.actualColumnName;
this.virtualColumnNumber = this.actualColumnNumber;
if (tableNum > -1) {
DMLQueryInfo current = qic.getCurrentScopeQueryInfo();
this.tqi = current.getTableQueryInfo(tableNum);
if (tqi != null) {
this.initResolverForColumnIfApplicable();
} else {
DMLQueryInfo root = qic.getRootQueryInfo();
if (root.isSelect() && qic.getNestingLevelOfScope() > 0) {
// It is possible that this column refers to an outer scope table.
// We need to find the Scope to which it belongs
Scope owningScope = qic.findOwningScope(tableNum);
if (owningScope != null) {
this.initResolverForOuterScopeColumn(cr, qic, owningScope);
this.isOuterScope = true;
} else {
// the subquery flag remains set as UNSUPPORTED_CORRELATED_SUBQUERY
}
}
}
}
// !!!:ezoerner:20090622 a null columnDescriptor is problem if we need the
// type for byte array formatting. Allow it for now, but may cause an NPE
// later
/*
assert this.columnDescriptor != null;
*/
}
private final ColumnDescriptor searchColumnDescriptor(final ResultColumn rc)
throws StandardException {
ValueNode vn;
ResultColumn rs = rc;
ColumnDescriptor cd = rc.getTableColumnDescriptor();
if (this.tableNum < 0) {
this.tableNum = rc.getTableNumber();
}
if (cd != null) {
return cd;
}
for (; ; ) {
if ((vn = rs.getExpression()) instanceof ColumnReference) {
rs = ((ColumnReference) vn).getSource();
} else if ((vn = rs.getExpression()) instanceof VirtualColumnNode) {
rs = ((VirtualColumnNode) vn).getSourceColumn();
} else {
break;
}
if (rs != null) {
cd = rs.getTableColumnDescriptor();
if (cd != null) {
this.tableNum = rs.getTableNumber();
break;
}
} else {
break;
}
}
return cd;
}
/**
* This constructor is invoked while analyzing the projection attributes
*
* @param rc ResultColumn
* @throws StandardException
* @see SelectQueryInfo#visit(com.pivotal.gemfirexd.internal.iapi.sql.compile.Visitable)
*/
ColumnQueryInfo(final ResultColumn rc, QueryInfoContext qic) throws StandardException {
final ColumnDescriptor cd = searchColumnDescriptor(rc);
if (cd != null) {
this.actualColumnName = cd.getColumnName();
this.actualColumnNumber = cd.getPosition();
this.columnDescriptor = cd;
this.columnType = cd.getType();
this.td = cd.getTableDescriptor();
} else {
String columnName = rc.getSourceColumnName();
if (columnName == null) {
columnName = rc.getActualName();
}
this.actualColumnName = columnName;
this.actualColumnNumber = rc.getColumnPosition();
this.columnType = rc.getType();
this.td = null;
this.columnDescriptor =
new ColumnDescriptor(
this.actualColumnName,
this.actualColumnNumber,
this.columnType,
null, // default
null, // defaultInfo
(UUID) null, // table uuid
(UUID) null, // default uuid
0L, // autoincStart
0L, // autoincInc
0L,
false); // autoincValue
}
if (tableNum > -1) {
DMLQueryInfo currentTop = qic.getCurrentScopeQueryInfo();
this.tqi = currentTop.getTableQueryInfo(tableNum);
// TODO:Asif Should we do correlation check here?
}
this.exposedColumnName = rc.getName();
this.virtualColumnNumber = rc.getVirtualColumnId();
assert this.columnDescriptor != null;
}