docs: Fix formatting of allow_single_file_parallelism

datafusion/common/src/config.rs

@@ -1507,7 +1507,7 @@ config_namespace! {
         /// (writing) Controls whether DataFusion will attempt to speed up writing
         /// parquet files by serializing them in parallel. Each column
         /// in each row group in each output file are serialized in parallel
-        /// leveraging a maximum possible core count of n_files*n_row_groups*n_columns.
+        /// leveraging a maximum possible core count of n_files\*n_row_groups\*n_columns.
         pub allow_single_file_parallelism: bool, default = true
 
         /// (writing) By default parallel parquet writer is tuned for minimum

datafusion/sqllogictest/test_files/information_schema.slt

@@ -392,7 +392,7 @@ datafusion.execution.max_spill_file_size_bytes 134217728 Maximum size in bytes f
 datafusion.execution.meta_fetch_concurrency 32 Number of files to read in parallel when inferring schema and statistics
 datafusion.execution.minimum_parallel_output_files 4 Guarantees a minimum level of output files running in parallel. RecordBatches will be distributed in round robin fashion to each parallel writer. Each writer is closed and a new file opened once soft_max_rows_per_output_file is reached.
 datafusion.execution.objectstore_writer_buffer_size 10485760 Size (bytes) of data buffer DataFusion uses when writing output files. This affects the size of the data chunks that are uploaded to remote object stores (e.g. AWS S3). If very large (>= 100 GiB) output files are being written, it may be necessary to increase this size to avoid errors from the remote end point.
-datafusion.execution.parquet.allow_single_file_parallelism true (writing) Controls whether DataFusion will attempt to speed up writing parquet files by serializing them in parallel. Each column in each row group in each output file are serialized in parallel leveraging a maximum possible core count of n_files*n_row_groups*n_columns.
+datafusion.execution.parquet.allow_single_file_parallelism true (writing) Controls whether DataFusion will attempt to speed up writing parquet files by serializing them in parallel. Each column in each row group in each output file are serialized in parallel leveraging a maximum possible core count of n_files\*n_row_groups\*n_columns.
 datafusion.execution.parquet.binary_as_string false (reading) If true, parquet reader will read columns of `Binary/LargeBinary` with `Utf8`, and `BinaryView` with `Utf8View`. Parquet files generated by some legacy writers do not correctly set the UTF8 flag for strings, causing string columns to be loaded as BLOB instead. The parquet reader has special optimizations for `Utf8` validation, so reading such columns as strings is significantly faster than reading them as binary and then casting to string.
 datafusion.execution.parquet.bloom_filter_fpp NULL (writing) Sets bloom filter false positive probability. If NULL, uses default parquet writer setting
 datafusion.execution.parquet.bloom_filter_ndv NULL (writing) Sets bloom filter number of distinct values. If NULL, uses default parquet writer setting

docs/source/user-guide/configs.md

@@ -112,7 +112,7 @@ The following configuration settings are available:
 | datafusion.execution.parquet.bloom_filter_on_write                      | false                     | (writing) Write bloom filters for all columns when creating parquet files                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
 | datafusion.execution.parquet.bloom_filter_fpp                           | NULL                      | (writing) Sets bloom filter false positive probability. If NULL, uses default parquet writer setting                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
 | datafusion.execution.parquet.bloom_filter_ndv                           | NULL                      | (writing) Sets bloom filter number of distinct values. If NULL, uses default parquet writer setting                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
-| datafusion.execution.parquet.allow_single_file_parallelism              | true                      | (writing) Controls whether DataFusion will attempt to speed up writing parquet files by serializing them in parallel. Each column in each row group in each output file are serialized in parallel leveraging a maximum possible core count of n_files*n_row_groups*n_columns.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
+| datafusion.execution.parquet.allow_single_file_parallelism              | true                      | (writing) Controls whether DataFusion will attempt to speed up writing parquet files by serializing them in parallel. Each column in each row group in each output file are serialized in parallel leveraging a maximum possible core count of n_files\*n_row_groups\*n_columns.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
 | datafusion.execution.parquet.maximum_parallel_row_group_writers         | 1                         | (writing) By default parallel parquet writer is tuned for minimum memory usage in a streaming execution plan. You may see a performance benefit when writing large parquet files by increasing maximum_parallel_row_group_writers and maximum_buffered_record_batches_per_stream if your system has idle cores and can tolerate additional memory usage. Boosting these values is likely worthwhile when writing out already in-memory data, such as from a cached data frame.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
 | datafusion.execution.parquet.maximum_buffered_record_batches_per_stream | 2                         | (writing) By default parallel parquet writer is tuned for minimum memory usage in a streaming execution plan. You may see a performance benefit when writing large parquet files by increasing maximum_parallel_row_group_writers and maximum_buffered_record_batches_per_stream if your system has idle cores and can tolerate additional memory usage. Boosting these values is likely worthwhile when writing out already in-memory data, such as from a cached data frame.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
 | datafusion.execution.parquet.content_defined_chunking.enabled           | false                     | (writing) EXPERIMENTAL: Enable content-defined chunking (CDC) when writing parquet files. When enabled, parallel writing is automatically disabled since the chunker state must persist across row groups.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |