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feat: support _partitiondate and _partitiontime pseudo column bq #49

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Merged
merged 1 commit into from
Dec 12, 2024
Merged

feat: support _partitiondate and _partitiontime pseudo column bq #49

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21 changes: 19 additions & 2 deletions mc2mc/internal/client/client.go
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Original file line number Diff line number Diff line change
Expand Up @@ -73,8 +73,8 @@ func (c *Client) Execute(ctx context.Context, tableID, queryFilePath string) err
if err != nil {
return errors.WithStack(err)
}
// construct query with ordered columns
queryRaw = constructQueryWithOrderedColumns(queryRaw, columnNames)
// construct query with ordered columns and BQ pseudo columns for ingestion time
queryRaw = constructQueryWithOrderedColumnsWithBQIngestionTime(queryRaw, columnNames)
}

if c.enablePartitionValue && !c.enableAutoPartition {
Expand Down Expand Up @@ -111,6 +111,23 @@ func addPartitionValueColumn(rawQuery []byte) []byte {
return []byte(fmt.Sprintf("%s SELECT *, STRING(CURRENT_DATE()) as __partitionvalue FROM (%s)", header, qr))
}

// constructQueryWithOrderedColumnsWithBQIngestionTime constructs query with ordered columns and BQ pseudo columns for ingestion time
// ref: https://cloud.google.com/bigquery/docs/querying-partitioned-tables#query_an_ingestion-time_partitioned_table
func constructQueryWithOrderedColumnsWithBQIngestionTime(query []byte, orderedColumns []string) []byte {
var orderedColumnsWithBQIngestionTime []string
for _, col := range orderedColumns {
val := col
switch col {
case "_partitiontime":
val = "CURRENT_TIMESTAMP() as _partitiontime"
case "_partitiondate":
val = "CURRENT_DATE() as _partitiondate"
}
orderedColumnsWithBQIngestionTime = append(orderedColumnsWithBQIngestionTime, val)
}
return constructQueryWithOrderedColumns(query, orderedColumnsWithBQIngestionTime)
}

func constructQueryWithOrderedColumns(query []byte, orderedColumns []string) []byte {
header, qr := loader.SeparateHeadersAndQuery(string(query))
return []byte(fmt.Sprintf("%s %s", header, loader.ConstructQueryWithOrderedColumns(qr, orderedColumns)))
Expand Down
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