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Add BLOCK column clustering for Snowflake tables #181

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Merged
cayetanobv merged 1 commit into from
Dec 1, 2025
Merged

Add BLOCK column clustering for Snowflake tables #181

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16 changes: 16 additions & 0 deletions raster_loader/io/snowflake.py
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Original file line number Diff line number Diff line change
Expand Up @@ -86,6 +86,17 @@ def __init__(
def band_rename_function(self, band_name: str):
return band_name

def add_clustering(self, fqn: str):
"""Add clustering by BLOCK column for query optimization."""
fqn = fqn.upper()
try:
cluster_query = f"ALTER TABLE {fqn} CLUSTER BY (BLOCK)"
self.execute(cluster_query)
except Exception:
# Clustering might fail if table already has clustering,
# so we silently ignore errors
pass

def write_metadata(
self,
metadata,
Expand Down Expand Up @@ -310,6 +321,11 @@ def band_rename_function(x):

self.write_metadata(metadata, append_records, fqn)

# Add clustering on new tables for query optimization
if not append_records:
print("Adding clustering by BLOCK column...")
self.add_clustering(fqn)

except IncompatibleRasterException as e:
raise IOError("Error uploading to Snowflake: {}".format(e.message))

Expand Down