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Data Engineering
Join discussions on data engineering best practices, architectures, and optimization strategies within the Databricks Community. Exchange insights and solutions with fellow data engineers.
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Forum Posts

schnee1
by New Contributor III
  • 7333 Views
  • 8 replies
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Access struct elements inside dataframe?

I have JSON data set that contains a price in a string like "USD 5.00". I'd like to convert the numeric portion to a Double to use in an MLLIB LabeledPoint, and have managed to split the price string into an array of string. The below creates a data...

  • 7333 Views
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goldentriangle
New Contributor II
  • 0 kudos

Thanks, Golden Triangle Tour

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kishorekumar
by New Contributor
  • 1234 Views
  • 1 replies
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Silent failure in DataFrameWriter when loading data to Redshift

Context:I'm using DataFrameWriter to load the dataSet into the Redshift. DataFrameWriter writes the dataSet to S3, and loads data from S3 to Redshift by issuing the Redshift copy command. Issue:In frequently we are observing, the data is present in t...

  • 1234 Views
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Anonymous
Not applicable
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Hi @Kishorekumar Somasundaram​ Great to meet you, and thanks for your question! Let's see if your peers in the community have an answer to your question. Thanks.

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Erik_L
by Contributor II
  • 1830 Views
  • 3 replies
  • 1 kudos

Resolved! How to keep data in time-based localized clusters after joining?

I have a bunch of data frames from different data sources. They are all time series data in order of a column timestamp, which is an int32 Unix timestamp. I can join them together by this and another column join_idx which is basically an integer inde...

  • 1830 Views
  • 3 replies
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Anonymous
Not applicable
  • 1 kudos

@Erik Louie​ :If the data frames have different time zones, you can use Databricks' timezone conversion function to convert them to a common time zone. You can use the from_utc_timestamp or to_utc_timestampfunction to convert the timestamp column to ...

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Vindhya
by New Contributor II
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Dataframes to Pandas conversion step is failing with exception ""java.lang.IndexOutOfBoundsException: index: 16384, length: 4 (expected: range(0, 16384))"

Dataframes to Pandas conversion step is failing with exception ""java.lang.IndexOutOfBoundsException: index: 16384, length: 4 (expected: range(0, 16384))", PFB screenshot for more details

sccreenshot
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Anonymous
Not applicable
  • 0 kudos

Hi @Vindhya D​ Thank you for posting your question in our community! We are happy to assist you.To help us provide you with the most accurate information, could you please take a moment to review the responses and select the one that best answers you...

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lambarc
by New Contributor II
  • 10892 Views
  • 7 replies
  • 13 kudos

How to read file in pyspark with “]|[” delimiter

The data looks like this: pageId]|[page]|[Position]|[sysId]|[carId 0005]|[bmw]|[south]|[AD6]|[OP4 There are atleast 50 columns and millions of rows. I did try to use below code to read: dff = sqlContext.read.format("com.databricks.spark.csv").option...

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  • 13 kudos
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rohit199912
New Contributor II
  • 13 kudos

you might also try the blow option.1). Use a different file format: You can try using a different file format that supports multi-character delimiters, such as text JSON.2). Use a custom Row class: You can write a custom Row class to parse the multi-...

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Gaurav_784295
by New Contributor III
  • 1991 Views
  • 2 replies
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pyspark.sql.utils.AnalysisException: Non-time-based windows are not supported on streaming DataFrames/Datasets

pyspark.sql.utils.AnalysisException: Non-time-based windows are not supported on streaming DataFrames/DatasetsGetting this error while writing can any one please tell how we can resolve it

  • 1991 Views
  • 2 replies
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Gaurav_784295
New Contributor III
  • 0 kudos

I'm trying to run query on some table and then storing that result in some table .query = stream .writeStream .format("delta") .foreachBatch(batch_function) \ .option('checkpointLocation', self.checkpoint_loc) .trigger(processingTime...

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lmcglone
by New Contributor II
  • 3589 Views
  • 2 replies
  • 3 kudos

Comparing 2 dataframes and create columns from values within a dataframe

Hi,I have a dataframe that has name and companyfrom pyspark.sql import SparkSessionspark = SparkSession.builder.appName('SparkByExamples.com').getOrCreate()columns = ["company","name"]data = [("company1", "Jon"), ("company2", "Steve"), ("company1", "...

image
  • 3589 Views
  • 2 replies
  • 3 kudos
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Hubert-Dudek
Esteemed Contributor III
  • 3 kudos

You need to join and pivotdf .join(df2, on=[df.company == df2.job_company])) .groupBy("company", "name") .pivot("job_company") .count()

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SIRIGIRI
by Contributor
  • 1357 Views
  • 3 replies
  • 2 kudos

sharikrishna26.medium.com

Spark Dataframes SchemaSchema inference is not reliable.We have the following problems in schema inference:Automatic inferring of schema is often incorrectInferring schema is additional work for Spark, and it takes some extra timeSchema inference is ...

  • 1357 Views
  • 3 replies
  • 2 kudos
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Varshith
New Contributor III
  • 2 kudos

one other difference between those 2 approaches is that In Schema DDL String approach we use STRING, INT etc.. But In Struct Type Object approach we can only use Spark datatypes such as StringType(), IntegerType(), etc..

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Jack
by New Contributor II
  • 6094 Views
  • 1 replies
  • 1 kudos

Python: Generate new dfs from a list of dataframes using for loop

I have a list of dataframes (for this example 2) and want to apply a for-loop to the list of frames to generate 2 new dataframes. To start, here is my starting dataframe called df_final:First, I create 2 dataframes: df2_b2c_fast, df2_b2b_fast:for x i...

df_long view
  • 6094 Views
  • 1 replies
  • 1 kudos
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Aviral-Bhardwaj
Esteemed Contributor III
  • 1 kudos

thanks

  • 1 kudos
THIAM_HUATTAN
by Valued Contributor
  • 1249 Views
  • 2 replies
  • 0 kudos

Resolved! Save data from Spark DataFrames to TFRecords

https://docs.microsoft.com/en-us/azure/databricks/_static/notebooks/deep-learning/tfrecords-save-load.htmlI could not run the Cell # 2java.lang.ClassNotFoundException: --------------------------------------------------------------------------- Py4JJ...

  • 1249 Views
  • 2 replies
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jose_gonzalez
Moderator
  • 0 kudos

Hi @THIAM HUAT TAN​,Which DBR version are you using? are you using the ML runtime?

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bhargavi1
by New Contributor II
  • 1154 Views
  • 1 replies
  • 1 kudos
  • 1154 Views
  • 1 replies
  • 1 kudos
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jose_gonzalez
Moderator
  • 1 kudos

Hi,Could you share more details on what you have tried? please provide more details.

  • 1 kudos
Jack
by New Contributor II
  • 3692 Views
  • 2 replies
  • 1 kudos

Append an empty dataframe to a list of dataframes using for loop in python

I have the following 3 dataframes:I want to append df_forecast to each of df2_CA and df2_USA using a for-loop. However when I run my code, df_forecast is not appending: df2_CA and df2_USA appear exactly as shown above.Here’s the code:df_list=[df2_CA,...

image image
  • 3692 Views
  • 2 replies
  • 1 kudos
Latest Reply
Kaniz_Fatma
Community Manager
  • 1 kudos

Hi @Jack Homareau​ , We haven’t heard from you on the last response from @Arvind Ravish​ , and I was checking back to see if you have a resolution yet. If you have any solution, please do share that with the community as it can be helpful to others. ...

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steelman
by New Contributor III
  • 8648 Views
  • 6 replies
  • 7 kudos

Resolved! how to flatten non standard Json files in a dataframe

hello, I have a non standard Json file with a nested file structure that I have issues with. Here is an example of the json file. jsonfile= """[ { "success":true, "numRows":2, "data":{ "58251":{ "invoiceno":"58...

desired format in the dataframe after processing the json file
  • 8648 Views
  • 6 replies
  • 7 kudos
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Deepak_Bhutada
Contributor III
  • 7 kudos

@stale stokkereit​ You can use the below function to flatten the struct fieldimport pyspark.sql.functions as F   def flatten_df(nested_df): flat_cols = [c[0] for c in nested_df.dtypes if c[1][:6] != 'struct'] nested_cols = [c[0] for c in nest...

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RiyazAli
by Valued Contributor
  • 5418 Views
  • 6 replies
  • 6 kudos

Resolved! Is there a way to CONCAT two dataframes on either of the axis (row/column) and transpose the dataframe in PySpark?

I'm reshaping my dataframe as per requirement and I came across this situation where I'm concatenating 2 dataframes and then transposing them. I've done this previously using pandas and the syntax for pandas goes as below:import pandas as pd   df1 = ...

  • 5418 Views
  • 6 replies
  • 6 kudos
Latest Reply
RiyazAli
Valued Contributor
  • 6 kudos

Hi @Kaniz Fatma​ ,I no longer see the answer you've posted, but I see you were suggesting to use `union`. As per my understanding, union are used to stack the dfs one upon another with similar schema / column names.In my situation, I have 2 different...

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