Write minimal columns #154
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added 4 commits
June 9, 2016 00:18
…tic FWD declaration)
… not every column 1. In multicornGetForeignRelSize use parsetree->targetList instead of baserel->reltargetlist to request a scan of only the requested columns, not all columns 1. In MulticornModifyState struct add update_columns_list to hold the list of columns to be updated 1. In PlanForeignModify return a list of the columns to be udpated by modify operation 1. In BeginForeignModify collect the list that was pushed to the modify operations and store it in fdw_private 1. In ExecForeignUpdate pass the column_update_list to the python object for use in update function 1. Update __init__ to add new method for 4 parameter update method
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When doing UPDATE operations the current API will read the whole record and then write a complete new record.
This update only reads the columns specifically requested and only writes the columns specifically requested so minimising back and forth to the foreign server.