fresh-borzoni commented on code in PR #151:
URL: https://github.com/apache/fluss-rust/pull/151#discussion_r2680424455
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bindings/python/example/example.py:
##########
@@ -178,6 +178,28 @@ async def main():
except Exception as e:
print(f"Error during scanning: {e}")
+ # Demo: Column projection
+ print("\n--- Testing Column Projection ---")
+ try:
+ # Project specific columns by index (C++ parity)
+ print("\n1. Projection by index [0, 1] (id, name):")
+ scanner_index = await table.new_log_scanner_with_projection([0, 1])
+ scanner_index.subscribe(None, None)
+ df_projected = scanner_index.to_pandas()
+ print(df_projected.head())
+ print(f" Projected {df_projected.shape[1]} columns:
{list(df_projected.columns)}")
+
+ # Project specific columns by name (Python-specific, more idiomatic!)
+ print("\n2. Projection by name ['name', 'score'] (Pythonic):")
+ scanner_names = await table.new_log_scanner_with_column_names(["name",
"score"])
+ scanner_names.subscribe(None, None)
+ df_named = scanner_names.to_pandas()
+ print(df_named.head())
+ print(f" Projected {df_named.shape[1]} columns:
{list(df_named.columns)}")
Review Comment:
I'm not sure I get what you mean. to_pandas polls internally, but if we are
talking about adding separate polling API to python bindings - we can add it.
Let's file an issue for it, as it's orthogonal.
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