| March 2013 | Vol. 36 No. 1 |
IEEE Computer Society
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Letters |
| Letter from the Editor-in-Chief | David Lomet | 1 |
| Letter from the TCDE Chair | Kyu-Young Whang | 2 |
| Letter from the Special Issue Editor | S. Sudarshan | 4 |
Special Issue on Query Optimization for Big Data Systems |
| A What-if Engine for Cost-based MapReduce Optimization | Herodotos Herodotou and Shivnath Babu | 5 |
| Efficient OR Hadoop: Why not both? |   |
| Jens Dittrich, Stefan Richter, Stefan Schuh, and Jorge-Arnulfo Quiané-Ruiz | 15 |
| Managing Skew in Hadoop | YongChul Kwon, Kai Ren, Magdalena Balazinska, and Bill Howe | 24 |
| Apache Pig's Optimizer | Alan F. Gates, Jianyong Dai, and Thejas Nair | 34 |
| Recurring Job Optimization for Massively Distributed Query Processing |   |
| Nicolas Bruno, Sapna Jain, and Jingren Zhou | 46 |
| A Common Compiler Framework for Big Data Languages: Motivation, Opportunities, and Benefits |   |
| Vinayak R. Borkar and Michael J. Carey | 56 |
Announcements and Notices |
| International Conference on Data Engineering (ICDE) | backcover |