pq | Pure Go Postgres driver for database/sql | SQL Database library
kandi X-RAY | pq Summary
kandi X-RAY | pq Summary
Pure Go Postgres driver for database/sql
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pq Key Features
pq Examples and Code Snippets
def __init__(self, graph, start_vertex):
self._pq = MinPQ()
self._marked = defaultdict(bool)
self._mst = Queue()
self.visit(graph, start_vertex)
while not self._pq.is_empty():
edge = self._pq.del_mi
def __init__(self, size: int) -> None:
"""Max priority queue initialization.
Args:
size (int): priority queue size
"""
self._pq = [MIN_VAL] * (size + 1)
self._size = 0
self._min = None
Community Discussions
Trending Discussions on pq
QUESTION
I receive a daily export of data every day I load into my excel sheet via Power Query. The table of data I can't control is:
tblExport
Name Company States Jane Doe ABC AK,AL,GA,WA John Smith ACME AK,GA,FL,WAI need to replace those State Abbreviations with a technology string of information for this question I'll use "Full State Name" as a substitute. So basically it checks the COMPANY field against another table as the "technology Strings" will be different for each Company per State.
So far so good, or so I thought. Then I split delimiters of tblExport.States BY "," which then I get
Name Company States.1 States.2 States.3 States.4 Jane Doe ABC AK AL GA WA John Smith ACME AK GA FL WANow we reference that table that contains the Company, State, FullStateNames
tblStateNames
COMPANY Abbr State Name ABC AL AlabamaABC ABC AK AlaskaABC ACME AK AlaskaACME ACME GA GeorgiaACME ABC FL FloridaABC ABC WA WashingtonABC ACME WA WashingtonACME ...ANSWER
Answered 2022-Mar-20 at 15:55If I understand, here is one way to do it:
- Read in the two tables
- split the Export table state abbreviations into ROWS
- Join with the StateName Table
- Group by Name and Company
- Extract a delimited list of the state names from each subtable
- Expand that list
Please read the code comments and explore the Applied Steps to better understand what is going on
QUESTION
I'm trying to simply insert the following into the postgres database by using Go's pq library (I'm following Let's Go book, but using Postgres instead of mySQL):
...ANSWER
Answered 2022-Mar-07 at 08:47You may multiply interval '1 day'
by a bound parameter, to achieve the correct interval you want.
QUESTION
I am trying to retrieve some municipalities from Wikidata using SPARQL but several items returned have much of their fields empty despite these items having these data. I do not understand what is wrong with the query below (link to WQS). For example, the municipality Almelo has its coordinates (P625
), and parent place (P131
) erroneously missing in the results:
ANSWER
Answered 2022-Feb-11 at 11:10You have to declare OPTIONAL
each statement independently:
QUESTION
I am just getting started learning docker a few hours ago and I trying to make my own docker image. When I tried to make a Dockerfile and a docker image, I got this error message "/bin/sh: 1: source: not found".
First of all, I manage my environment variables in .env file. Whenever I change my env file, I run this command $source .env and go build . and then go run main.go. So, I tried to set up my Dockerfile, RUN source.env but I got the error that I mentioned above.
I tried
- RUN . setting.env & . setting but didn't work
- change the file name into setting.env and then RUN . ./setting.env & . ./setting & ["/bin/bash", "-c", "source ~/.setting.env"] also didn't work...
I really appreciate your help!
Edit 1]
...ANSWER
Answered 2022-Mar-01 at 06:47It seems like .env file is not contained in your image.
Try to execute source .env after copying .env file into the image.
QUESTION
I looked at the standard documentation that I would expect to capture my need (Apache Arrow and Pandas), and I could not seem to figure it out.
I know Python best, so I would like to use Python, but it is not a strict requirement.
ProblemI need to move Parquet files from one location (a URL) to another (an Azure storage account, in this case using the Azure machine learning platform, but this is irrelevant to my problem).
These files are too large to simply perform pd.read_parquet("https://my-file-location.parquet")
, since this reads the whole thing into an object.
I thought that there must be a simple way to create a file object and stream that object line by line -- or maybe column chunk by column chunk. Something like
...ANSWER
Answered 2021-Aug-24 at 06:21This is possible but takes a little bit of work because in addition to being columnar Parquet also requires a schema.
The rough workflow is:
Open a parquet file for reading.
Then use iter_batches to read back chunks of rows incrementally (you can also pass specific columns you want to read from the file to save IO/CPU).
You can then transform each
pa.RecordBatch
fromiter_batches
further. Once you are done transforming the first batch you can get its schema and create a new ParquetWriter.For each transformed batch call write_table. You have to first convert it to a
pa.Table
.Close the files.
Parquet requires random access, so it can't be streamed easily from a URI (pyarrow should support it if you opened the file via HTTP FSSpec) but I think you might get blocked on writes.
QUESTION
I am failing to implement a numba jitted priority queue.
Heavily plagiarized from the python docs, I am fairly happy with this class.
...ANSWER
Answered 2021-Sep-15 at 10:48This was not possible due to several issues in numba, but should be fixed for the next release (0.55) if I understood correctly. As a workaround for now, I could get it working by compiling llvmlite 0.38.0dev0 and the master branch of numba. I do not use conda but it is apparently easier to get pre-releases of llvmlite and numba this way.
Here is my implementation:
QUESTION
The code is compiled, and run without any issue in CLion IDE with g++ compiler in MinGW, however, the same exact code has a compilation error in Visual Studio IDE and with (MSVC compiler)
I believe the error should have to do with the follwoing comparator class:
...ANSWER
Answered 2022-Feb-03 at 21:36Your somewhat odd comparator...
QUESTION
I designed a circular queue program which provides queue management system. Everything works fine, except that in some cases, I can't print the queue.
My code:
...ANSWER
Answered 2021-Dec-22 at 10:29Following your suggestion, let's see what happens when we insert 4 customers, then remove 2, then insert 2 more:
Initially:
QUESTION
TL (see TL;DR near the end of the question)
I came about this data with pipes as field delimiters (|
) and backslash-quote pairs as quotes (\"
) to fields with delimiters in the data, such as:
ANSWER
Answered 2021-Dec-21 at 13:40You seem to be trying to use [^\\\"]
to mean not the string \"
but it doesn't mean that, it means neither the char \ nor the char "
. You need to have a single char to negate in that part of the FPAT
regexp so the approach is to convert every \"
in the input to a single char that can't be present in the input (I use \n
below as that's usually RS
but you can use any char that can't be in the record), then split the record into fields, and then restore the \"
s before using each individual field:
QUESTION
- I have a pandas DataFrame:
ANSWER
Answered 2021-Dec-11 at 12:02I think you need give ParquetDataset
a hint of the partition keys schema.
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