Merge pull request #15 from Hugoberry/pbix2vpax-exceptions

Pbix2vpax exceptions

Author: Hugoberry

PBIX2VPAX.md

@@ -0,0 +1,143 @@
+# Advanced Analysis Examples using pbix2vpax()
+
+## Comparing Model Versions
+
+**Track changes between model versions:**
+```sql
+WITH 
+current_version AS (
+    SELECT pbix2vpax('Sales_Model_v2.pbix') as analysis
+),
+previous_version AS (
+    SELECT pbix2vpax('Sales_Model_v1.pbix') as analysis
+),
+current_measures AS (
+    SELECT 
+        meas.MeasureName,
+        meas.TableName,
+        meas.MeasureExpression,
+        meas.DataType
+    FROM (SELECT UNNEST((SELECT analysis FROM current_version).Measures) as meas)
+),
+previous_measures AS (
+    SELECT 
+        meas.MeasureName,
+        meas.TableName,
+        meas.MeasureExpression,
+        meas.DataType
+    FROM (SELECT UNNEST((SELECT analysis FROM previous_version).Measures) as meas)
+),
+current_tables AS (
+    SELECT 
+        tab.TableName,
+        tab.RowsCount,
+        tab.TableSize,
+        part.RefreshedTime
+    FROM (SELECT UNNEST((SELECT analysis FROM current_version).Tables) as tab),
+         (SELECT UNNEST((SELECT analysis FROM current_version).Partitions) as part)
+    WHERE tab.TableName = part.TableName
+),
+previous_tables AS (
+    SELECT 
+        tab.TableName,
+        tab.RowsCount,
+        tab.TableSize,
+        part.RefreshedTime
+    FROM (SELECT UNNEST((SELECT analysis FROM previous_version).Tables) as tab),
+         (SELECT UNNEST((SELECT analysis FROM previous_version).Partitions) as part)
+    WHERE tab.TableName = part.TableName
+)
+SELECT 
+    'Measure Changes' as ChangeType,
+    c.MeasureName as Name,
+    c.TableName,
+    CASE 
+        WHEN p.MeasureName IS NULL THEN 'Added'
+        WHEN c.MeasureExpression != p.MeasureExpression THEN 'Modified'
+        ELSE 'Unchanged'
+    END as Status,
+    c.MeasureExpression as CurrentDefinition,
+    p.MeasureExpression as PreviousDefinition
+FROM current_measures c
+LEFT JOIN previous_measures p ON c.MeasureName = p.MeasureName AND c.TableName = p.TableName
+WHERE p.MeasureName IS NULL OR c.MeasureExpression != p.MeasureExpression
+
+UNION ALL
+
+SELECT 
+    'Table Size Changes' as ChangeType,
+    c.TableName as Name,
+    NULL as TableName,
+    'Modified' as Status,
+    CONCAT(
+        'Rows: ', c.RowsCount, ' (', 
+        CASE WHEN c.RowsCount > p.RowsCount THEN '+' ELSE '' END,
+        c.RowsCount - p.RowsCount, ') | ',
+        'Size: ', ROUND(c.TableSize / 1024.0 / 1024.0, 2), 'MB (',
+        CASE WHEN c.TableSize > p.TableSize THEN '+' ELSE '' END,
+        ROUND((c.TableSize - p.TableSize) / 1024.0 / 1024.0, 2), 'MB) | ',
+        'Last Refresh: ', c.RefreshedTime
+    ) as CurrentDefinition,
+    CONCAT(
+        'Rows: ', p.RowsCount, ' | ',
+        'Size: ', ROUND(p.TableSize / 1024.0 / 1024.0, 2), 'MB | ',
+        'Last Refresh: ', p.RefreshedTime
+    ) as PreviousDefinition
+FROM current_tables c
+INNER JOIN previous_tables p ON c.TableName = p.TableName
+WHERE c.RowsCount != p.RowsCount OR ABS(c.TableSize - p.TableSize) > 1024
+ORDER BY ChangeType, Status DESC, Name;
+```
+
+## Batch Analysis Across Multiple Files
+
+**Search for DAX functions across all models:**
+```sql
+WITH model_measures AS (
+    SELECT 
+        file,
+        UNNEST(pbix2vpax(file).Measures) as meas
+    FROM (SELECT unnest(glob('data/reports/**/*.pbix')) as file)
+)
+SELECT 
+    file,
+    meas.TableName,
+    meas.MeasureName,
+    meas.MeasureExpression,
+    CASE 
+        WHEN meas.MeasureExpression ILIKE '%USERELATIONSHIP%' THEN 'USERELATIONSHIP'
+        WHEN meas.MeasureExpression ILIKE '%CALCULATE%' THEN 'CALCULATE'
+        WHEN meas.MeasureExpression ILIKE '%TREATAS%' THEN 'TREATAS'
+        WHEN meas.MeasureExpression ILIKE '%CROSSFILTER%' THEN 'CROSSFILTER'
+    END as DAXFunction
+FROM model_measures
+WHERE meas.MeasureExpression ILIKE '%USERELATIONSHIP%'
+   OR meas.MeasureExpression ILIKE '%TREATAS%'
+   OR meas.MeasureExpression ILIKE '%CROSSFILTER%'
+ORDER BY DAXFunction, file, meas.MeasureName;
+```
+
+**Find models with specific table structures:**
+```sql
+-- Find all models that have a 'Date' table with specific columns
+WITH model_columns AS (
+    SELECT 
+        REGEXP_EXTRACT(file, '([^/]+)\.pbix$', 1) as ModelName,
+        file,
+        col.TableName,
+        col.ColumnName,
+        col.DataType
+    FROM (SELECT unnest(glob('data/reports/**/*.pbix')) as file),
+    LATERAL (SELECT UNNEST(pbix2vpax(file).Columns) as col)
+    WHERE col.TableName = 'Date'
+)
+SELECT 
+    ModelName,
+    file,
+    STRING_AGG(ColumnName, ', ' ORDER BY ColumnName) as DateColumns,
+    COUNT(*) as ColumnCount
+FROM model_columns
+GROUP BY ModelName, file
+HAVING COUNT(*) >= 5  -- Models with at least 5 date columns
+ORDER BY ColumnCount DESC;
+```