filtering

## Overview Filtering restricts which rows contribute to a result. The same expression language applies across three contexts in Honeydew: | Context | Where it appears | When it runs | | ------------------------ | --------------------------------------------------------- | ------------------ | | **Structured query** | `filters` parameter in `get_data_from_fields` / `get_sql_from_fields` | Pre-aggregation | | **Metric aggregation** | `FILTER (WHERE ...)` on an aggregation | During aggregation | | **Attribute expression** | `CASE WHEN ... END` in attribute SQL | Per-row evaluation | | **Metric value filter** | Metric expression in `filters` parameter | Post-aggregation | --- ## Filter Expression Syntax ### Comparisons ```sql entity.field = 'value' entity.field > 100 entity.field >= 3 AND entity.field < 10 ``` Operators: `=`, `<`, `>`, `>=`, `<=`, `!=` You can compare an attribute to a constant or to another attribute. Cast mismatching types when comparing (e.g., `entity.field::DATE`). ### Strings ```sql entity.field = 'exact value' entity.field IN ('val1', 'val2', 'val3') entity.field ILIKE '%keyword%' ``` - `ILIKE` is case-insensitive pattern matching (`%` = any characters, `_` = one character) ### Full-Text Search (Snowflake only) Use `SEARCH` when you don't know exact values and need to find possible matches. ```sql -- Single sear...