Parquet Metadata#

class pylibcudf.io.parquet_metadata.ParquetColumnSchema#

Schema of a parquet column, including the nested columns.

Parameters:

parquet_column_schema

Methods

`child`(self, int idx)	Returns schema of the child with the given index.
`children`(self)	Returns schemas of all child columns.
`name`(self)	Returns parquet column name; can be empty.
`num_children`(self)	Returns the number of child columns.

child(self, int idx) → ParquetColumnSchema#

Returns schema of the child with the given index.

Parameters:

idxint: Child Index

Returns:

ParquetColumnSchema: Child schema

children(self) → list#

Returns schemas of all child columns.

Returns:

list[ParquetColumnSchema]: Child schemas.

name(self) → unicode#

Returns parquet column name; can be empty.

Returns:

str: Column name

num_children(self) → int#

Returns the number of child columns.

Returns:

int: Children count

class pylibcudf.io.parquet_metadata.ParquetMetadata#

Information about content of a parquet file.

Parameters:

parquet_metadata

Methods

`metadata`(self)	Returns the key-value metadata in the file footer.
`num_rowgroups`(self)	Returns the number of rowgroups in the file.
`num_rows`(self)	Returns the number of rows of the root column.
`rowgroup_metadata`(self)	Returns the row group metadata in the file footer.
`schema`(self)	Returns the parquet schema.

metadata(self) → dict#

Returns the key-value metadata in the file footer.

Returns:

dict[str, str]: Key value metadata as a map.

num_rowgroups(self) → int#

Returns the number of rowgroups in the file.

Returns:

int: Number of row groups.

num_rows(self) → int#

Returns the number of rows of the root column.

Returns:

int: Number of rows

rowgroup_metadata(self) → list#

Returns the row group metadata in the file footer.

Returns:

list[dict[str, int]]: Vector of row group metadata as maps.

schema(self) → ParquetSchema#

Returns the parquet schema.

Returns:

ParquetSchema: Parquet schema

class pylibcudf.io.parquet_metadata.ParquetSchema#

Schema of a parquet file.

Parameters:

parquet_schema

Methods

root(self)

Returns the schema of the struct column that contains all columns as fields.

root(self) → ParquetColumnSchema#

Returns the schema of the struct column that contains all columns as fields.

Returns:

ParquetColumnSchema: Root column schema

pylibcudf.io.parquet_metadata.read_parquet_metadata(SourceInfo src_info) → ParquetMetadata#

Reads metadata of parquet dataset.

Parameters:

src_infoSourceInfo: Dataset source.

Returns:

ParquetMetadata: Parquet_metadata with parquet schema, number of rows, number of row groups and key-value metadata.