Weiyuan Wu

# read_sql(): read data from database to pandas/dask dataframe through a sql query ## Introduction Databases is one of the most commonly used data source that data scientists fetch data...

Detect not null columns of a postgres table

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so that we can allocate a block of memory instead of the extension array (less cache miss).

skimage will have the step size of the last patch reduced if it is not possible to create patches with a uniform step size. `unpatchify` should relax the uniform step...

Return type of return_order_book should not be a Map

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Actually, not all return value from Poloniex is a JSON object, for now, `return_order_book` is an exception. I make a change to these methods to return `Result`, which delegates the...

Color and Shape Legends Not Combined in Line Chart or Multiple Charts

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Code to reproduce: ### In line chart: ```python df = pd.DataFrame( data=[[0, 10, "a"], [1, 20, "a"], [0, 15, "b"], [1, 25, "b"]], columns=["x", "y", "c"] ) alt.Chart(df).mark_line().encode( x="x", y="y",...

e.g. this is the payload: `{"channel":"ticker","market":"SRN-PERP","type":"update","data":{"bid":null,"ask":null,"bidSize":null,"askSize":null,"last":0.00385,"time":1656893927.97223}}` Change `Ticker` to ``` pub struct Ticker { pub bid: Option, pub ask: Option, pub bid_size: Option, pub ask_size: Option, pub last: Decimal, #[serde_as(as...