private void generateColumnsFromQuery() {
int columnCount = asQuery.getColumnCount();
ArrayList<Expression> expressions = asQuery.getExpressions();
for (int i = 0; i < columnCount; i++) {
Expression expr = expressions.get(i);
int type = expr.getType();
String name = expr.getAlias();
long precision = expr.getPrecision();
int displaySize = expr.getDisplaySize();
DataType dt = DataType.getDataType(type);
if (precision > 0
&& (dt.defaultPrecision == 0
|| (dt.defaultPrecision > precision && dt.defaultPrecision < Byte.MAX_VALUE))) {
// dont' set precision to MAX_VALUE if this is the default
precision = dt.defaultPrecision;
}
int scale = expr.getScale();
if (scale > 0
&& (dt.defaultScale == 0 || (dt.defaultScale > scale && dt.defaultScale < precision))) {
scale = dt.defaultScale;
}
if (scale > precision) {
precision = scale;
}
Column col = new Column(name, type, precision, scale, displaySize);
addColumn(col);
}
}
private void initColumnsAndTables(Session session) {
Column[] cols;
removeViewFromTables();
try {
Query query = recompileQuery(session);
tables = New.arrayList(query.getTables());
ArrayList<Expression> expressions = query.getExpressions();
ArrayList<Column> list = New.arrayList();
for (int i = 0; i < query.getColumnCount(); i++) {
Expression expr = expressions.get(i);
String name = null;
if (columnNames != null && columnNames.length > i) {
name = columnNames[i];
}
if (name == null) {
name = expr.getAlias();
}
int type = expr.getType();
long precision = expr.getPrecision();
int scale = expr.getScale();
int displaySize = expr.getDisplaySize();
Column col = new Column(name, type, precision, scale, displaySize);
col.setTable(this, i);
list.add(col);
}
cols = new Column[list.size()];
list.toArray(cols);
createException = null;
viewQuery = query;
} catch (DbException e) {
createException = e;
// if it can't be compiled, then it's a 'zero column table'
// this avoids problems when creating the view when opening the
// database
tables = New.arrayList();
cols = new Column[0];
if (recursive && columnNames != null) {
cols = new Column[columnNames.length];
for (int i = 0; i < columnNames.length; i++) {
cols[i] = new Column(columnNames[i], Value.STRING);
}
index.setRecursive(true);
createException = null;
}
}
setColumns(cols);
if (getId() != 0) {
addViewToTables();
}
}
@Override
public void prepare() {
if (isPrepared) {
// sometimes a subquery is prepared twice (CREATE TABLE AS SELECT)
return;
}
if (SysProperties.CHECK && !checkInit) {
DbException.throwInternalError("not initialized");
}
isPrepared = true;
left.prepare();
right.prepare();
int len = left.getColumnCount();
// set the correct expressions now
expressions = New.arrayList();
ArrayList<Expression> le = left.getExpressions();
ArrayList<Expression> re = right.getExpressions();
for (int i = 0; i < len; i++) {
Expression l = le.get(i);
Expression r = re.get(i);
int type = Value.getHigherOrder(l.getType(), r.getType());
long prec = Math.max(l.getPrecision(), r.getPrecision());
int scale = Math.max(l.getScale(), r.getScale());
int displaySize = Math.max(l.getDisplaySize(), r.getDisplaySize());
Column col = new Column(l.getAlias(), type, prec, scale, displaySize);
Expression e = new ExpressionColumn(session.getDatabase(), col);
expressions.add(e);
}
if (orderList != null) {
initOrder(session, expressions, null, orderList, getColumnCount(), true, null);
sort = prepareOrder(orderList, expressions.size());
orderList = null;
}
expressionArray = new Expression[expressions.size()];
expressions.toArray(expressionArray);
}