[Solr Wiki] Update of "DataImportHandlerDeltaQueryViaFullImport" by DanielRijkhof

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The "DataImportHandlerDeltaQueryViaFullImport" page has been changed by DanielRijkhof:
http://wiki.apache.org/solr/DataImportHandlerDeltaQueryViaFullImport?action=diff&rev1=3&rev2=4

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  When doing a normal full import solr defaults the {{{clean}}} to {{{true}}} (watch out you can override this default in the solrconfig.xml so you might want to always set it explicitly to true). As a result the first part of the WHERE condition will be {{{'true' != 'false'}}} which any decent RDBMS will figure out will lead to the entire all always evaluating to true aka reading the entire table: {{{http://localhost:8983/solr/core0/dataimport?command=full-import&clean=true}}}
  
- Now when doing a delta import you do not use the delta import, but instead you do a normal full-import but with the {{{clear}}} GET parameter set to {{{false}}}: {{{http://localhost:8983/solr/core0/dataimport?command=full-import&clean=false}}}
+ Now when doing a delta import you do not use the delta import, but instead you do a normal full-import but with the {{{clean}}} GET parameter set to {{{false}}}: {{{http://localhost:8983/solr/core0/dataimport?command=full-import&clean=false}}}
  
  In this case the first part of the WHERE will be {{{'false' != 'false'}}} which is obviously always false and any RDBMS should optimize that away and just evaluate the second condition.