METHOD AND SYSTEM FOR DISTRIBUTED QUERY ENGINE PIPELINE OF DATA SOURCE INCLUDES DIFFERENT DATA MODELS

摘要

PROBLEM TO BE SOLVED: To provide an architecture capable of avoiding the problem that a monolithic query processor adaptable to a change in inquiry language factor is designed and constructed.;SOLUTION: The architecture comprises cascaded analysis engines that accept an input query and each identifies a portion of the input query. Each stage rewrites the input query to remove the portion identified and replaces it with a placeholder. The rewritten query is forwarded to the next analysis engine in the cascade. Each analysis engine compiles the portion it identified so that an execution engine may process that portion. Execution preferably proceeds from the portion of the query compiled by the last analysis engine. The execution engine corresponding to the last analysis engine executes the query and makes a call to the next higher execution engine in the cascade for data from the preceding portion.;COPYRIGHT: (C)2005,JPO&NCIPI