Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
add implementation of HashJoinPlan#getExplainPlan
Merge remote-tracking branch 'upstream/master'
Add JoinQueryCompileTest#testExplainPlan
Add JoinQueryCompileTest#testExplainPlan
Merge remote-tracking branch 'upstream/master'
Merge pull request #537 from maryannxue/master

Issue #503 Augment explain plan for join queries