File-based driver properties

File drivers allow you to interact with various file formats, like CSV, Excel, JSON, XML, and Parquet, as if they were databases. Each driver comes with customizable properties to control how data is read and processed.

General properties

Property	Description	Default value
defaultSchema	Default schema name.	default
firstRow	First row to read. Row numbering starts at 1.	1
rowCount	Maximum number of rows to read. -1 means no limit.	-1
scanSubfolders	Scan subfolders for data files.	true
subfolderNameSeparator	Defines the separator used in subfolder names within schema names.	__
licensePath	Path to the driver's license file (for use outside of Team Edition).
internalDbBatchSize	Internal database batch size.	1000
internalDbFilePath	Internal database file path.
internalDbTransactionSize	A number of batches in a single transaction.	10
useInternalDb	Use internal database for complex queries.	true
partitioningStrategy	Defines how files are grouped into tables. Available values: none, folder, and pattern.	none
partitioningRegex	Regular expression used with pattern to extract the logical table name from file names.	^(.+)[_-].*$

File partitioning

Use partitioningStrategy to group multiple files of the same format into one logical table.

A logical table is a table shown by the driver in Team Edition. It can represent one file or a group of files, depending on the partitioning strategy. The source files aren’t physically merged. The driver reads matching files together and displays them as one table.

Available values:

• none: Each file is a separate table.
• folder: Files in the same folder are grouped into one table.
• pattern: Files are grouped into separate logical tables by the table name extracted from file names.

Use partitioningRegex with pattern to extract the logical table name. The first capture group defines the table name. For each extracted name, the driver creates a separate logical table and reads matching files into that table. Files with different extracted names are shown as separate tables.

Example

With the default regex ^(.+)[_-].*$:

Files	Logical table
data_01.csv, data_02.csv	data
events-2023.json, events-2024.json	events

Note

Files with different formats aren’t combined into the same table. For example, data_01.csv and data_02.parquet aren’t grouped together, even if the regex returns the same logical table name.

CSV driver properties

Property	Description	Default value
separator	The delimiter to use for separating entries.	,
escapeChar	The character to use for escaping a separator or quote.	\
quoteChar	The character to use for quoted elements.	"
strictQuotes	Sets if characters outside the quotes are ignored.	false
ignoreLeadingWhitespace	If true, parser should ignore white space before a quote in a field.	true
ignoreQuotations	If true, treat quotations like any other character.	false
nullFieldIndicator	Which field content will be returned as null.	NEITHER
trimWhitespaces	If true, parser should trim whitespaces from the beginning and end of the field.	true
header	If true, the first row is treated as a header.	true
sampleRows	Number of rows to extract metadata from.	5
wildcard	Wildcard for file names.	**.{csv,tcv,txt}

XLSX driver properties

Property	Description	Default value
header	Indicates if the file has a header.	true
sampleRows	Number of rows to extract metadata from.	5
wildcard	Wildcard for file names.	**.{xlsx}
schemaNameMode	Defines how the schema name is formed:	RELATIVE_DIR_PATH
	- RELATIVE_DIR_PATH: Uses the concatenated relative path of the directory, and the table name is $file_name + _ + $sheet_name.
	- RELATIVE_FILE_PATH: Uses the relative file path to generate the schema name. Each sheet in the file becomes a table.

JSON driver properties

Property	Description	Default value
sampleRows	Number of rows to extract metadata from.	5
wildcard	Wildcard for file names.	**.{json}

XML driver properties

Property	Description	Default value
sampleRows	Number of rows to extract metadata from.	5
wildcard	Wildcard for file names.	**.{xml}

Parquet driver properties

Property	Description	Default value
tmpFolder	Temporary folder for storing downloaded Parquet files from Cloud Storages.
wildcard	Wildcard for file names.	**.{parquet}