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Support parallel bitmap heap scans.
The index is scanned by a single process, but then all cooperating processes can iterate jointly over the resulting set of heap blocks. In the future, we might also want to support using a parallel bitmap index scan to set up for a parallel bitmap heap scan, but that's a job for another day. Dilip Kumar, with some corrections and cosmetic changes by me. The larger patch set of which this is a part has been reviewed and tested by (at least) Andres Freund, Amit Khandekar, Tushar Ahuja, Rafia Sabih, Haribabu Kommi, Thomas Munro, and me. Discussion: http://postgr.es/m/CAFiTN-uc4=0WxRGfCzs-xfkMYcSEWUC-Fon6thkJGjkh9i=13A@mail.gmail.com
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@ -1633,6 +1633,7 @@ _readBitmapOr(void)
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ReadCommonPlan(&local_node->plan);
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READ_BOOL_FIELD(isshared);
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READ_NODE_FIELD(bitmapplans);
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READ_DONE();
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@ -1744,6 +1745,7 @@ _readBitmapIndexScan(void)
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ReadCommonScan(&local_node->scan);
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READ_OID_FIELD(indexid);
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READ_BOOL_FIELD(isshared);
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READ_NODE_FIELD(indexqual);
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READ_NODE_FIELD(indexqualorig);
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