Prevent panics

Author: kyleconroy

internal/compiler/output_columns.go

@@ -608,6 +608,9 @@ func (c *Compiler) sourceTables(qc *QueryCatalog, node ast.Node) ([]*Table, erro
 			if err != nil {
 				return nil, err
 			}
+			if qc == nil {
+				return nil, fmt.Errorf("query catalog is empty")
+			}
 			table, cerr := qc.GetTable(fqn)
 			if cerr != nil {
 				// TODO: Update error location

internal/compiler/resolve.go

@@ -63,7 +63,10 @@ func (comp *Compiler) resolveCatalogRefs(qc *QueryCatalog, rvs []*ast.RangeVar,
 		}
 		table, err := c.GetTable(fqn)
 		if err != nil {
-			// If the table name doesn't exist, fisrt check if it's a CTE
+			if qc == nil {
+				continue
+			}
+			// If the table name doesn't exist, first check if it's a CTE
 			if _, qcerr := qc.GetTable(fqn); qcerr != nil {
 				return nil, err
 			}