The ink was still drying on Sun's billion-dollar deal to buy the webby, low-end open source database house MySQL when Sun turned around and put money in the high-end open source Postgres company Greenplum, evidently what Sun CEO Jonathan Schwartz meant last week when he said 'and we ain't finished yet.' Schwartz did say that Sun would continue to invest in Postgres, Oracle and JavaDB last week when Sun's MySQL buy was announced. Looks like we should have taken him literally. Greenplum also attracted SAP, which has no track record of open source investments, as another strategic investor - and SAP is fresh from closing its acquisition of Business Objects, the Franco-American BI concern.