void parseDisplayColumns(VoltXMLElement columnsNode) {
for (VoltXMLElement child : columnsNode.children) {
ParsedColInfo col = new ParsedColInfo();
col.expression = parseExpressionTree(child);
if (col.expression instanceof ConstantValueExpression) {
assert (col.expression.getValueType() != VoltType.NUMERIC);
}
ExpressionUtil.finalizeValueTypes(col.expression);
assert (col.expression != null);
col.alias = child.attributes.get("alias");
if (child.name.equals("columnref")) {
col.columnName = child.attributes.get("column");
col.tableName = child.attributes.get("table");
} else {
// XXX hacky, assume all non-column refs come from a temp table
col.tableName = "VOLT_TEMP_TABLE";
col.columnName = "";
}
// This index calculation is only used for sanity checking
// materialized views (which use the parsed select statement but
// don't go through the planner pass that does more involved
// column index resolution).
col.index = displayColumns.size();
displayColumns.add(col);
}
}
void parseGroupByColumn(VoltXMLElement groupByNode) {
ParsedColInfo col = new ParsedColInfo();
col.expression = parseExpressionTree(groupByNode);
assert (col.expression != null);
if (groupByNode.name.equals("columnref")) {
col.alias = groupByNode.attributes.get("alias");
col.columnName = groupByNode.attributes.get("column");
col.tableName = groupByNode.attributes.get("table");
col.groupBy = true;
} else {
throw new RuntimeException("GROUP BY with complex expressions not yet supported");
}
assert (col.alias.equalsIgnoreCase(col.columnName));
assert (getTableFromDB(col.tableName) != null);
assert (getTableFromDB(col.tableName).getColumns().getIgnoreCase(col.columnName) != null);
org.voltdb.catalog.Column catalogColumn =
getTableFromDB(col.tableName).getColumns().getIgnoreCase(col.columnName);
col.index = catalogColumn.getIndex();
groupByColumns.add(col);
}
