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class="breadcrumbs__item"><span class="breadcrumbs__link breadcrumbsItemLink_e5ie">Miscellaneous</span></li><li class="breadcrumbs__item breadcrumbs__item--active"><a class="breadcrumbs__link breadcrumbsItemLink_e5ie" href="/docs/miscellaneous/chart-params">Chart Parameters Reference</a></li></ul></nav><div class="tocCollapsible_jdIR theme-doc-toc-mobile tocMobile_TmEX"><button type="button" class="clean-btn tocCollapsibleButton_Fzxq">On this page</button></div><div class="theme-doc-markdown markdown"><h2 class="anchor anchorWithStickyNavbar_mojV" id="chart-parameters">Chart Parameters<a class="hash-link" href="#chart-parameters" title="Direct link to heading"></a></h2><p>Chart parameters are stored as a JSON encoded string in the <code>slices.params</code> column and are often referenced throughout the code as form-data. Currently the form-data is neither versioned nor typed as thus is somewhat free-formed. Note in the future there may be merit in using something like <a href="https://json-schema.org/" target="_blank" rel="noopener noreferrer">JSON Schema</a> to both annotate and validate the JSON object in addition to using a Mypy <code>TypedDict</code> (introduced in Python 3.8) for typing the form-data in the backend. This section serves as a potential primer for that work.</p><p>The following tables provide a non-exhaustive list of the various fields which can be present in the JSON object grouped by the Explorer pane sections. These values were obtained by extracting the distinct fields from a legacy deployment consisting of tens of thousands of charts and thus some fields may be missing whilst others may be deprecated.</p><p>Note not all fields are correctly categorized. The fields vary based on visualization type and may appear in different sections depending on the type. Verified deprecated columns may indicate a missing migration and/or prior migrations which were unsuccessful and thus future work may be required to clean up the form-data.</p><h3 class="anchor anchorWithStickyNavbar_mojV" id="datasource--chart-type">Datasource & Chart Type<a class="hash-link" href="#datasource--chart-type" title="Direct link to heading"></a></h3><table><thead><tr><th>Field</th><th>Type</th><th>Notes</th></tr></thead><tbody><tr><td><code>database_name</code></td><td><em>string</em></td><td><em>Deprecated?</em></td></tr><tr><td><code>datasource</code></td><td><em>string</em></td><td><code><datasouce_id>__<datasource_type></code></td></tr><tr><td><code>datasource_id</code></td><td><em>string</em></td><td><em>Deprecated?</em> See <code>datasource</code></td></tr><tr><td><code>datasource_name</code></td><td><em>string</em></td><td><em>Deprecated?</em></td></tr><tr><td><code>datasource_type</code></td><td><em>string</em></td><td><em>Deprecated?</em> See <code>datasource</code></td></tr><tr><td><code>viz_type</code></td><td><em>string</em></td><td>The <strong>Visualization Type</strong> widget</td></tr></tbody></table><h3 class="anchor anchorWithStickyNavbar_mojV" id="time">Time<a class="hash-link" href="#time" title="Direct link to heading"></a></h3><table><thead><tr><th>Field</th><th>Type</th><th>Notes</th></tr></thead><tbody><tr><td><code>druid_time_origin</code></td><td><em>string</em></td><td>The Druid <strong>Origin</strong> widget</td></tr><tr><td><code>granularity</code></td><td><em>string</em></td><td>The Druid <strong>Time Granularity</strong> widget</td></tr><tr><td><code>granularity_sqla</code></td><td><em>string</em></td><td>The SQLA <strong>Time Column</strong> widget</td></tr><tr><td><code>time_grain_sqla</code></td><td><em>string</em></td><td>The SQLA <strong>Time Grain</strong> widget</td></tr><tr><td><code>time_range</code></td><td><em>string</em></td><td>The <strong>Time range</strong> widget</td></tr></tbody></table><h3 class="anchor anchorWithStickyNavbar_mojV" id="group-by">GROUP BY<a class="hash-link" href="#group-by" title="Direct link to heading"></a></h3><table><thead><tr><th>Field</th><th>Type</th><th>Notes</th></tr></thead><tbody><tr><td><code>metrics</code></td><td><em>array(string)</em></td><td>See Query section</td></tr><tr><td><code>order_asc</code></td><td>-</td><td>See Query section</td></tr><tr><td><code>row_limit</code></td><td>-</td><td>See Query section</td></tr><tr><td><code>timeseries_limit_metric</code></td><td>-</td><td>See Query section</td></tr></tbody></table><h3 class="anchor anchorWithStickyNavbar_mojV" id="not-grouped-by">NOT GROUPED BY<a class="hash-link" href="#not-grouped-by" title="Direct link to heading"></a></h3><table><thead><tr><th>Field</th><th>Type</th><th>Notes</th></tr></thead><tbody><tr><td><code>order_by_cols</code></td><td><em>array(string)</em></td><td>The <strong>Ordering</strong> widget</td></tr><tr><td><code>row_limit</code></td><td>-</td><td>See Query section</td></tr></tbody></table><h3 class="anchor anchorWithStickyNavbar_mojV" id="y-axis-1">Y Axis 1<a class="hash-link" href="#y-axis-1" title="Direct link to heading"></a></h3><table><thead><tr><th>Field</th><th>Type</th><th>Notes</th></tr></thead><tbody><tr><td><code>metric</code></td><td>-</td><td>The <strong>Left Axis Metric</strong> widget. See Query section</td></tr><tr><td><code>y_axis_format</code></td><td>-</td><td>See Y Axis section</td></tr></tbody></table><h3 class="anchor anchorWithStickyNavbar_mojV" id="y-axis-2">Y Axis 2<a class="hash-link" href="#y-axis-2" title="Direct link to heading"></a></h3><table><thead><tr><th>Field</th><th>Type</th><th>Notes</th></tr></thead><tbody><tr><td><code>metric_2</code></td><td>-</td><td>The <strong>Right Axis Metric</strong> widget. See Query section</td></tr></tbody></table><h3 class="anchor anchorWithStickyNavbar_mojV" id="query">Query<a class="hash-link" href="#query" title="Direct link to heading"></a></h3><table><thead><tr><th>Field</th><th>Type</th><th>Notes</th></tr></thead><tbody><tr><td><code>adhoc_filters</code></td><td><em>array(object)</em></td><td>The <strong>Filters</strong> widget</td></tr><tr><td><code>extra_filters</code></td><td><em>array(object)</em></td><td>Another pathway to the <strong>Filters</strong> widget.<br>It is generally used to pass dashboard filter parameters to a chart.<br>It can be used for appending additional filters to a chart that has been saved with its own filters on an ad-hoc basis if the chart is being used as a standalone widget.<br><br>For implementation examples see : <a href="https://github.com/apache/superset/blob/66a4c94a1ed542e69fe6399bab4c01d4540486cf/tests/utils_tests.py#L181" target="_blank" rel="noopener noreferrer">utils test.py</a><br>For insight into how superset processes the contents of this parameter see: <a href="https://github.com/apache/superset/blob/93c7f5bb446ec6895d7702835f3157426955d5a9/superset-frontend/src/explore/exploreUtils/index.js#L159" target="_blank" rel="noopener noreferrer">exploreUtils/index.js</a></td></tr><tr><td><code>columns</code></td><td><em>array(string)</em></td><td>The <strong>Breakdowns</strong> widget</td></tr><tr><td><code>groupby</code></td><td><em>array(string)</em></td><td>The <strong>Group by</strong> or <strong>Series</strong> widget</td></tr><tr><td><code>limit</code></td><td><em>number</em></td><td>The <strong>Series Limit</strong> widget</td></tr><tr><td><code>metric</code><br><code>metric_2</code><br><code>metrics</code><br><code>percent_mertics</code><br><code>secondary_metric</code><br><code>size</code><br><code>x</code><br><code>y</code></td><td><em>string</em>,<em>object</em>,<em>array(string)</em>,<em>array(object)</em></td><td>The metric(s) depending on the visualization type</td></tr><tr><td><code>order_asc</code></td><td><em>boolean</em></td><td>The <strong>Sort Descending</strong> widget</td></tr><tr><td><code>row_limit</code></td><td><em>number</em></td><td>The <strong>Row limit</strong> widget</td></tr><tr><td><code>timeseries_limit_metric</code></td><td><em>object</em></td><td>The <strong>Sort By</strong> widget</td></tr></tbody></table><p>The <code>metric</code> (or equivalent) and <code>timeseries_limit_metric</code> fields are all composed of either metric names or the JSON representation of the <code>AdhocMetric</code> TypeScript type. The <code>adhoc_filters</code> is composed of the JSON represent of the <code>AdhocFilter</code> TypeScript type (which can comprise of columns or metrics depending on whether it is a WHERE or HAVING clause). The <code>all_columns</code>, <code>all_columns_x</code>, <code>columns</code>, <code>groupby</code>, and <code>order_by_cols</code> fields all represent column names.</p><h3 class="anchor anchorWithStickyNavbar_mojV" id="chart-options">Chart Options<a class="hash-link" href="#chart-options" title="Direct link to heading"></a></h3><table><thead><tr><th>Field</th><th>Type</th><th>Notes</th></tr></thead><tbody><tr><td><code>color_picker</code></td><td><em>object</em></td><td>The <strong>Fixed Color</strong> widget</td></tr><tr><td><code>label_colors</code></td><td><em>object</em></td><td>The <strong>Color Scheme</strong> widget</td></tr><tr><td><code>normalized</code></td><td><em>boolean</em></td><td>The <strong>Normalized</strong> widget</td></tr></tbody></table><h3 class="anchor anchorWithStickyNavbar_mojV" id="y-axis">Y Axis<a class="hash-link" href="#y-axis" title="Direct link to heading"></a></h3><table><thead><tr><th>Field</th><th>Type</th><th>Notes</th></tr></thead><tbody><tr><td><code>y_axis_2_label</code></td><td><em>N/A</em></td><td><em>Deprecated?</em></td></tr><tr><td><code>y_axis_format</code></td><td><em>string</em></td><td>The <strong>Y Axis Format</strong> widget</td></tr><tr><td><code>y_axis_zero</code></td><td><em>N/A</em></td><td><em>Deprecated?</em></td></tr></tbody></table><p>Note the <code>y_axis_format</code> is defined under various section for some charts.</p><h3 class="anchor anchorWithStickyNavbar_mojV" id="other">Other<a class="hash-link" href="#other" title="Direct link to heading"></a></h3><table><thead><tr><th>Field</th><th>Type</th><th>Notes</th></tr></thead><tbody><tr><td><code>color_scheme</code></td><td><em>string</em></td><td></td></tr></tbody></table><h3 class="anchor anchorWithStickyNavbar_mojV" id="unclassified">Unclassified<a class="hash-link" href="#unclassified" title="Direct link to heading"></a></h3><table><thead><tr><th>Field</th><th>Type</th><th>Notes</th></tr></thead><tbody><tr><td><code>add_to_dash</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>code</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>collapsed_fieldsets</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>comparison type</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>country_fieldtype</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>default_filters</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>entity</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>expanded_slices</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>filter_immune_slice_fields</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>filter_immune_slices</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>flt_col_0</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>flt_col_1</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>flt_eq_0</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>flt_eq_1</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>flt_op_0</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>flt_op_1</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>goto_dash</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>import_time</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>label</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>linear_color_scheme</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>new_dashboard_name</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>new_slice_name</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>num_period_compare</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>period_ratio_type</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>perm</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>rdo_save</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>refresh_frequency</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>remote_id</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>resample_fillmethod</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>resample_how</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>rose_area_proportion</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>save_to_dashboard_id</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>schema</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>series</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>show_bubbles</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>slice_name</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>timed_refresh_immune_slices</code></td><td><em>N/A</em></td><td></td></tr><tr><td><code>userid</code></td><td><em>N/A</em></td><td></td></tr></tbody></table></div><footer 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