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Adjust the query to keep the destination rather than replace. #1013

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merged 4 commits into from
Feb 14, 2024
Merged

Adjust the query to keep the destination rather than replace. #1013

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483274c
Adjust the query to keep the destination rather than replace.
calebbrown Feb 13, 2024
63ba480
Merge branch 'main' into bq_load_keep_dest
calebbrown Feb 13, 2024
8ca32bb
Update BQ load comments.
calebbrown Feb 13, 2024
579c36d
Merge branch 'main' into bq_load_keep_dest
calebbrown Feb 13, 2024
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16 changes: 15 additions & 1 deletion scripts/bq_load.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -62,7 +62,21 @@ for bucket_prefix in `gsutil ls "$RESULT_BUCKET"`; do
union="$union$subquery"
done

query="CREATE OR REPLACE TABLE \`$PROJECT_ID.$DEST_DATASET.$DEST_TABLE\` LIKE \`$PROJECT_ID.$LOAD_DATASET.$table_name\` PARTITION BY TIMESTAMP_TRUNC(CreatedTimestamp, DAY) OPTIONS(expiration_timestamp=NULL) AS $union;"
# Query to populate the destination table.
#
# If the table does not exist it will be created. Keeping the table ensures
# that breaking schema changes are not accidentally propagated to the
# destination table.
#
# A transaction is used to keep the update atomic. It will also rollback the
# TRUNCATE if the INSERT fails, such as when the schema has changed.
query="
CREATE TABLE IF NOT EXISTS \`$PROJECT_ID.$DEST_DATASET.$DEST_TABLE\` LIKE \`$PROJECT_ID.$LOAD_DATASET.$table_name\`
PARTITION BY TIMESTAMP_TRUNC(CreatedTimestamp, DAY) OPTIONS(expiration_timestamp=NULL);
BEGIN TRANSACTION;
TRUNCATE TABLE \`$PROJECT_ID.$DEST_DATASET.$DEST_TABLE\`;
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INSERT INTO \`$PROJECT_ID.$DEST_DATASET.$DEST_TABLE\` $union;
COMMIT TRANSACTION;"

echo "## Updating \`$PROJECT_ID.$DEST_DATASET.$DEST_TABLE\` from shards."
echo "Executing query: '$query'"
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