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TPC-H Q15 outputs unstable query results #424

Description

@wanweiqiangintel

Bug description

[Expected behavior] and [actual behavior].
When I use velox as the backend execution engine to test TPC-H, the output result is unstable. Sometimes it prints one result but sometimes the result is empty like below:
image

System information

Velox System Info v0.0.2
Commit: 0fd70ff
CMake Version: 3.27.2
System: Linux-5.15.0-spr.bkc.pc.16.4.24.x86_64
Arch: x86_64
C++ Compiler: /opt/rh/gcc-toolset-11/root/usr/bin/c++
C++ Compiler Version: 11.2.1
C Compiler: /opt/rh/gcc-toolset-11/root/usr/bin/cc
C Compiler Version: 11.2.1
CMake Prefix Path: /usr/local;/usr;/;/home/weiqiang/.local/lib/python3.8/site-packages/cmake/data;/usr/local;/usr/X11R6;/usr/pkg;/opt

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