parquetDatastore — Create a parquet datastore descriptor object.
parquetDatastore(files) creates a descriptor object with a Files property for parquet table workflows.
Syntax
B = tabularBuiltin(args...)Inputs
| Name | Type | Required | Default | Description |
|---|---|---|---|---|
args | Any | Variadic | — | Input values and name-value options. |
Returns
| Name | Type | Description |
|---|---|---|
out | Any | Result value. |
Errors
| Identifier | When | Message |
|---|---|---|
RunMat:table:InvalidArgument | Arguments or table metadata are invalid. | table: invalid argument |
RunMat:table:InvalidIndex | Table indexing is invalid. | table: invalid index |
RunMat:table:InvalidVariable | A table variable name or value is invalid. | table: invalid variable |
RunMat:readtable:IOError | readtable cannot open or read the requested file. | readtable: file read failed |
RunMat:readtable:UnsupportedFileType | readtable receives a file type outside the text or spreadsheet import backends. | readtable: unsupported file type |
How parquetDatastore works
- The constructor preserves file specifications for code that passes datastore descriptors around.
- Parquet decoding and iterator-style operations such as
read,hasdata, andresetrequire the generic datastore dispatch layer and are not provided by this constructor builtin.
Example
Create parquet datastore descriptor
ds = parquetDatastore('data.parquet')Expected output:
ds = parquetDatastore objectUsing parquetDatastore with coding agents
Open a RunMat example with live inputs, then ask the agent to explain how parquetDatastore changes the result.
Run a small parquetDatastore example, explain the result, then change one input and compare the output.
Related Io functions
Tabular
arrayDatastore · csvread · csvwrite · detectImportOptions · dlmread · dlmwrite · fileDatastore · parquetinfo · parquetread · readcell · readmatrix · readtimetable · spreadsheetImportOptions · writecell · writematrix · writetable · writetimetable · xlsread · xlswrite
Repl Fs
addpath · cd · copyfile · delete · dir · exist · fileattrib · fileparts · fullfile · genpath · getenv · getpref · isenv · isfile · isfolder · ispref · ls · matlabroot · memmapfile · mkdir · movefile · open · opentoline · path · pathsep · pcode · pwd · readstruct · rehash · restoredefaultpath · rmdir · rmpath · run · savepath · setenv · setpref · system · tempdir · tempname · uigetdir · uigetfile · uiputfile · unsetenv · userpath · what · winqueryreg · xmlread · xmlwrite
Filetext
fclose · feof · fgetl · fgets · fileread · filewrite · fopen · fprintf · fread · frewind · fwrite · readlines · writelines
Import
Json
Open-source implementation
Unlike proprietary runtimes, every RunMat function is open-source. Read exactly how parquetDatastore is executed, line by line, in Rust.
- View the source for parquetDatastore in Rust on GitHub
- Learn how the RunMat runtime works
- Found a bug? Open an issue with a minimal reproduction.
About RunMat
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