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What is the difference between partitioning and bucketing a table in Hive ?
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Partitioning data is often used for distributing load horizontally, this has performance benefit, and helps in organizing data in a logical fashion. Example: if we are dealing with a large employee table and often run queries with WHERE clauses that restrict the results to a particular ...
GDB missing in OS X v10.9 (Mavericks)
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I installed via brew, and keep getting "_____: not in executable format: File format not recognized" when I try to load an executable. Can anyone comment on how they got a successful install?
– Parker
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g++ undefined reference to typeinfo
...ill contain null-pointer most likely). However, nobody prohibits you from calling this pure virtual function in a non-virtual manner, i.e. by using a fully-qualified name. In this case the linker will look for the body, and you will have to define the function. And yes, you can define a body for a p...
Benchmarking (python vs. c++ using BLAS) and (numpy)
...e python for my program, what could I do to increase the performance when calling BLAS or LAPACK routines?
Make sure that numpy uses optimized version of BLAS/LAPACK libraries on your system.
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What is the maximum value for an int32?
...bout 1 billion. One of the 32 bits is used for sign, so the max value is really only 2^31, which is about twice the amount you get for 2^(3*10): 2 billion.
– 16807
Dec 3 '13 at 22:24
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获取文件系统映像及恢复删除的数据（FAT文件系统格式描述） - C/C++ - 清泛...
...iGetClassDevs(&CLSID_DeviceInstance, NULL, NULL, DIGCF_PRESENT); //getting all devices with a removable disk guid
if ( INVALID_HANDLE_VALUE == hDevInfo )
{
return devInfos;//exit if there are no devices
}
try
{
st...
“TypeError: (Integer) is not JSON serializable” when serializing JSON in Python?
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I found my problem. The issue was that my integers were actually type numpy.int64.
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Programmatically find the number of cores on a machine
...ne, if a system is capable of turning some off they might not be counted. Calling sysconf with "_SC_NPROCESSORS_CONF" will return the total CPUs configured.
– Chris S
Apr 23 '11 at 18:43
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Find out whether Chrome console is open
... answer. This solution takes advantage of the fact that toString() is not called on logged objects unless the console is open.
var devtools = /./;
devtools.toString = function() {
if (!this.opened) {
alert("Opened");
}
this.opened = true;
}
console.log('%c', devtools);
// devtools.ope...
Convert Rows to columns using 'Pivot' in SQL Server
...n but it is easier to see the correct code using a hard-coded version initially.
First up, here are some quick table definitions and data for use:
CREATE TABLE #yt
(
[Store] int,
[Week] int,
[xCount] int
);
INSERT INTO #yt
(
[Store],
[Week], [xCount]
)
VALUES
(102, 1, 96),
(...