Version limit

Create a filter to limit the number of versions of columns to retrieve.

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For detailed documentation that includes this code sample, see the following:

Code sample

C++

To learn how to install and use the client library for Bigtable, see Bigtable client libraries.

To authenticate to Bigtable, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

cbt::Filter filter = cbt::Filter::ColumnRangeClosed("family", "c0", "c0");

C#

To learn how to install and use the client library for Bigtable, see Bigtable client libraries.

To authenticate to Bigtable, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

RowFilter filter = RowFilters.CellsPerRowLimit(1);

Java

To learn how to install and use the client library for Bigtable, see Bigtable client libraries.

To authenticate to Bigtable, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

public void filterLimitCellsPerCol(String tableId) {
  // A filter that matches only the most recent cell within each column
  Filter filter = FILTERS.limit().cellsPerColumn(1);
  readRowFilter(tableId, filter);
  readFilter(tableId, filter);
}

Node.js

To learn how to install and use the client library for Bigtable, see Bigtable client libraries.

To authenticate to Bigtable, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

const filter = [
  {
    column: {
      cellLimit: 1, // Only retrieve the most recent version of the cell.
    },
  },
];

Python

To learn how to install and use the client library for Bigtable, see Bigtable client libraries.

To authenticate to Bigtable, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

# Create a filter to only retrieve the most recent version of the cell
# for each column across entire row.
row_filter = row_filters.CellsColumnLimitFilter(1)

Ruby

To learn how to install and use the client library for Bigtable, see Bigtable client libraries.

To authenticate to Bigtable, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

# Only retrieve the most recent version of the cell.
filter = Google::Cloud::Bigtable::RowFilter.cells_per_column 1

What's next

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