Module row_filters (1.4.0)

Filters for Google Cloud Bigtable Row classes.

Classes

ApplyLabelFilter

ApplyLabelFilter(label)

Filter to apply labels to cells.

Intended to be used as an intermediate filter on a pre-existing filtered result set. This way if two sets are combined, the label can tell where the cell(s) originated.This allows the client to determine which results were produced from which part of the filter.

Parameter

Name	Description
`label`	`str` Label to apply to cells in the output row. Values must be at most 15 characters long, and match the pattern `[a-z0-9-]+`.

BlockAllFilter

BlockAllFilter(flag)

Row filter that doesn't match any cells.

Parameter

Name	Description
`flag`	`bool` Does not match any cells, regardless of input. Useful for temporarily disabling just part of a filter.

CellsColumnLimitFilter

CellsColumnLimitFilter(num_cells)

Row filter to limit cells in a column.

Parameter

Name	Description
`num_cells`	`int` Matches only the most recent N cells within each column. This filters a (family name, column) pair, based on timestamps of each cell.

CellsRowLimitFilter

CellsRowLimitFilter(num_cells)

Row filter to limit cells in a row.

Parameter

Name	Description
`num_cells`	`int` Matches only the first N cells of the row.

CellsRowOffsetFilter

CellsRowOffsetFilter(num_cells)

Row filter to skip cells in a row.

Parameter

Name	Description
`num_cells`	`int` Skips the first N cells of the row.

ColumnQualifierRegexFilter

ColumnQualifierRegexFilter(regex)

Row filter for a column qualifier regular expression.

The regex must be valid RE2 patterns. See Google's RE2 reference_ for the accepted syntax.

.. _RE2 reference: https://github.com/google/re2/wiki/Syntax

Note: Special care need be used with the expression used. Since each of these properties can contain arbitrary bytes, the \C escape sequence must be used if a true wildcard is desired. The . character will not match the new line character \n, which may be present in a binary value.

Parameter

Name	Description
`regex`	`bytes` A regular expression (RE2) to match cells from column that match this regex (irrespective of column family).

ColumnRangeFilter

ColumnRangeFilter(
    column_family_id,
    start_column=None,
    end_column=None,
    inclusive_start=None,
    inclusive_end=None,
)

A row filter to restrict to a range of columns.

Both the start and end column can be included or excluded in the range. By default, we include them both, but this can be changed with optional flags.

Parameters

Name	Description
`column_family_id`	`str` The column family that contains the columns. Must be of the form `<code>_a-zA-Z0-9][-_.a-zA-Z0-9]</code>*`.
`start_column`	`bytes` The start of the range of columns. If no value is used, the backend applies no upper bound to the values.
`end_column`	`bytes` The end of the range of columns. If no value is used, the backend applies no upper bound to the values.
`inclusive_start`	`bool` Boolean indicating if the start column should be included in the range (or excluded). Defaults to :data:`True` if `start_column` is passed and no `inclusive_start` was given.
`inclusive_end`	`bool` Boolean indicating if the end column should be included in the range (or excluded). Defaults to :data:`True` if `end_column` is passed and no `inclusive_end` was given.

Exceptions

Type	Description
`ValueErro

ConditionalRowFilter

ConditionalRowFilter(base_filter, true_filter=None, false_filter=None)

Conditional row filter which exhibits ternary behavior.

Executes one of two filters based on another filter. If the base_filter returns any cells in the row, then true_filter is executed. If not, then false_filter is executed.

Note: The base_filter does not execute atomically with the true and false filters, which may lead to inconsistent or unexpected results. Additionally, executing a ConditionalRowFilter has poor performance on the server, especially when false_filter is set.

Parameters

Name	Description
`base_filter`	`RowFilter` The filter to condition on before executing the true/false filters.
`true_filter`	`RowFilter` (Optional) The filter to execute if there are any cells matching `base_filter`. If not provided, no results will be returned in the true case.
`false_filter`	`RowFilter` (Optional) The filter to execute if there are no cells matching `base_filter`. If not provided, no results will be returned in the false case.

FamilyNameRegexFilter

FamilyNameRegexFilter(regex)

Row filter for a family name regular expression.

The regex must be valid RE2 patterns. See Google's RE2 reference_ for the accepted syntax.

.. _RE2 reference: https://github.com/google/re2/wiki/Syntax

Parameter

Name	Description
`regex`	`str` A regular expression (RE2) to match cells from columns in a given column family. For technical reasons, the regex must not contain the `':'` character, even if it is not being used as a literal.

PassAllFilter

PassAllFilter(flag)

Row filter equivalent to not filtering at all.

Parameter

Name	Description
`flag`	`bool` Matches all cells, regardless of input. Functionally equivalent to leaving `filter` unset, but included for completeness.

RowFilter

RowFilter()

Basic filter to apply to cells in a row.

These values can be combined via RowFilterChain, RowFilterUnion and ConditionalRowFilter.

RowFilterChain

RowFilterChain(filters=None)

Chain of row filters.

Sends rows through several filters in sequence. The filters are "chained" together to process a row. After the first filter is applied, the second is applied to the filtered output and so on for subsequent filters.

Parameter

Name	Description
`filters`	`list` List of `RowFilter`

RowFilterUnion

RowFilterUnion(filters=None)

Union of row filters.

Sends rows through several filters simultaneously, then merges / interleaves all the filtered results together.

If multiple cells are produced with the same column and timestamp, they will all appear in the output row in an unspecified mutual order.

Parameter

Name	Description
`filters`	`list` List of `RowFilter`

RowKeyRegexFilter

RowKeyRegexFilter(regex)

Row filter for a row key regular expression.

The regex must be valid RE2 patterns. See Google's RE2 reference_ for the accepted syntax.

.. _RE2 reference: https://github.com/google/re2/wiki/Syntax

Parameter

Name	Description
`regex`	`bytes` A regular expression (RE2) to match cells from rows with row keys that satisfy this regex. For a `CheckAndMutateRowRequest`, this filter is unnecessary since the row key is already specified.

RowSampleFilter

RowSampleFilter(sample)

Matches all cells from a row with probability p.

Parameter

Name	Description
`sample`	`float` The probability of matching a cell (must be in the interval `(0, 1)` The end points are excluded).

SinkFilter

SinkFilter(flag)

Advanced row filter to skip parent filters.

Parameter

Name	Description
`flag`	`bool` ADVANCED USE ONLY. Hook for introspection into the row filter. Outputs all cells directly to the output of the read rather than to any parent filter. Cannot be used within the `predicate_filter`, `true_filter`, or `false_filter` of a `ConditionalRowFilter`.

StripValueTransformerFilter

StripValueTransformerFilter(flag)

Row filter that transforms cells into empty string (0 bytes).

Parameter

Name	Description
`flag`	`bool` If :data:`True`, replaces each cell's value with the empty string. As the name indicates, this is more useful as a transformer than a generic query / filter.

TimestampRange

TimestampRange(start=None, end=None)

Range of time with inclusive lower and exclusive upper bounds.

Parameters

Name	Description
`start`	`datetime.datetime` (Optional) The (inclusive) lower bound of the timestamp range. If omitted, defaults to Unix epoch.
`end`	`datetime.datetime` (Optional) The (exclusive) upper bound of the timestamp range. If omitted, no upper bound is used.

TimestampRangeFilter

TimestampRangeFilter(range_)

Row filter that limits cells to a range of time.

Parameter

Name	Description
`range_`	`TimestampRange` Range of time that cells should match against.

ValueRangeFilter

ValueRangeFilter(
    start_value=None, end_value=None, inclusive_start=None, inclusive_end=None
)

A range of values to restrict to in a row filter.

Will only match cells that have values in this range.

Both the start and end value can be included or excluded in the range. By default, we include them both, but this can be changed with optional flags.

Parameters

Name	Description
`start_value`	`bytes` The start of the range of values. If no value is used, the backend applies no lower bound to the values.
`end_value`	`bytes` The end of the range of values. If no value is used, the backend applies no upper bound to the values.
`inclusive_start`	`bool` Boolean indicating if the start value should be included in the range (or excluded). Defaults to :data:`True` if `start_value` is passed and no `inclusive_start` was given.
`inclusive_end`	`bool` Boolean indicating if the end value should be included in the range (or excluded). Defaults to :data:`True` if `end_value` is passed and no `inclusive_end` was given.

Exceptions

Type	Description
`ValueErro

ValueRegexFilter

ValueRegexFilter(regex)

Row filter for a value regular expression.

The regex must be valid RE2 patterns. See Google's RE2 reference_ for the accepted syntax.

.. _RE2 reference: https://github.com/google/re2/wiki/Syntax

Parameter

Name	Description
`regex`	`bytes` A regular expression (RE2) to match cells with values that match this regex.