checkpoint for supporting offset-based-indexing-unnest.
checkpoint #2: passed all tests for offset-based-indexing unnest.
Merge branch 'master' into jarodwen/features/positionvar
Merge branch 'master' into jarodwen/features/positionvar
Merge branch 'master' into jarodwen/features/positionvar
Merge branch 'master' into jarodwen/features/positionvar
try to fix memory leak issue
checkpoint for positional var debug
Merge branch 'master' into jarodwen/features/positionvar_local
disable the memory manager counter
Merge branch 'master' into jarodwen/features/positionvar
checkpoint: added support on running aggregation using group-by runtime.
Aggregator interface is also updated in order to handle both
accumulating and running aggregation.
checkpoint: fixed a issue when introducing the HashMergeExcnahge but
have not compute its delivered property, which could cause a NPE when
its delivered property by other operator.
merged master back
fix the shortestpaths input format
checkpoint: addressed Vinayak's review comments
Fix for asterix issue 630.
add update test
Merge branch 'master' into yingyi/fullstack_fix
fix debug state (was reverting to false; now static)