Examples of org.apache.derby.impl.sql.compile.QueryTreeNode.optimize()

org.apache.derby.impl.sql.compile.QueryTreeNode.optimize()

Generates an optimized QueryTree from a bound QueryTree. Actually, it annotates the tree in place rather than generating a new tree, but this interface allows the root node of the optmized QueryTree to be different from the root node of the bound QueryTree. For non-optimizable statements (for example, CREATE TABLE), return the bound tree without doing anything. For optimizable statements, this method will be over-ridden in the statement's root node (DMLStatementNode in all cases we know about so far). Throws an exception if the tree is not bound, or if the binding is out of date. @return An optimized QueryTree @exception StandardException Thrown on error

          if (preparedStmt.referencesSessionSchema(qt)) {
            if (foundInCache)
              ((GenericLanguageConnectionContext)lcc).removeStatement(this);
          }
          
          qt = qt.optimize();


          optimizeTime = getCurrentTimeMillis(lcc);


          // Statement logging if lcc.getLogStatementText() is true
          if (istream != null)

            if (SanityManager.DEBUG_ON("StopAfterBinding")) {
              throw StandardException.newException(SQLState.LANG_STOP_AFTER_BINDING);
            }
          }


          qt = qt.optimize();


          optimizeTime = getCurrentTimeMillis(lcc);


          // Statement logging if lcc.getLogStatementText() is true
          if (istream != null)

          if (preparedStmt.referencesSessionSchema(qt)) {
            if (foundInCache)
              ((GenericLanguageConnectionContext)lcc).removeStatement(this);
          }
          
          qt = qt.optimize();


          optimizeTime = getCurrentTimeMillis(lcc);


          // Statement logging if lcc.getLogStatementText() is true
          if (istream != null)

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