Configuration and Optimization

class Config:
    # Display and Formatting
    @classmethod
    def set_fmt_str_lengths(cls, n: int) -> type[Config]:
        """Set maximum string length in display."""
    
    @classmethod
    def set_fmt_float(cls, fmt: str) -> type[Config]:
        """Set float number formatting."""
    
    @classmethod
    def set_tbl_cols(cls, n: int) -> type[Config]:
        """Set maximum columns in table display."""
    
    @classmethod
    def set_tbl_rows(cls, n: int) -> type[Config]:
        """Set maximum rows in table display."""
    
    @classmethod
    def set_tbl_width_chars(cls, width: int) -> type[Config]:
        """Set table width in characters."""
    
    # Streaming Configuration
    @classmethod
    def set_streaming_chunk_size(cls, size: int) -> type[Config]:
        """Set streaming chunk size."""
    
    # Global Settings
    @classmethod
    def set_auto_structify(cls, active: bool) -> type[Config]:
        """Enable/disable automatic struct creation."""
    
    @classmethod
    def set_thousands_separator(cls, separator: str) -> type[Config]:
        """Set thousands separator in display."""
    
    @classmethod
    def set_decimal_separator(cls, separator: str) -> type[Config]:
        """Set decimal separator in display."""
    
    # Configuration Management
    @classmethod
    def restore_defaults(cls) -> type[Config]:
        """Restore all settings to defaults."""
    
    @classmethod
    def save(cls, file: str) -> None:
        """Save current configuration to file."""
    
    @classmethod
    def load(cls, file: str) -> type[Config]:
        """Load configuration from file."""
    
    # Context Manager Support
    def __enter__(self):
        """Enter configuration context."""
    
    def __exit__(self, exc_type, exc_val, exc_tb):
        """Exit configuration context."""

class QueryOptFlags:
    def __init__(
        self,
        *,
        type_coercion=True,
        predicate_pushdown=True,
        projection_pushdown=True,
        simplify_expression=True,
        slice_pushdown=True,
        comm_subplan_elim=True,
        comm_subexpr_elim=True,
        cluster_with_columns=True,
        streaming=False
    ):
        """
        Query optimization flags.
        
        Parameters:
        - type_coercion: Enable type coercion optimization
        - predicate_pushdown: Push predicates down to data sources
        - projection_pushdown: Push column projections down
        - simplify_expression: Simplify expressions
        - slice_pushdown: Push slice operations down
        - comm_subplan_elim: Eliminate common subplans
        - comm_subexpr_elim: Eliminate common subexpressions
        - cluster_with_columns: Cluster with_columns operations
        - streaming: Enable streaming execution
        """

class GPUEngine:
    def __init__(
        self,
        *,
        device=None,
        memory_resource=None,
        raise_on_fail=False
    ):
        """
        GPU execution engine configuration.
        
        Parameters:
        - device: GPU device ID
        - memory_resource: GPU memory resource
        - raise_on_fail: Raise error if GPU execution fails
        """

import polars as pl

# Set display options
pl.Config.set_tbl_rows(20)
pl.Config.set_tbl_cols(10)
pl.Config.set_fmt_str_lengths(50)

# Create DataFrame to see formatting
df = pl.DataFrame({
    "long_column_name": ["very long string value"] * 100,
    "numbers": range(100)
})

print(df)  # Will use new display settings

# Temporary configuration changes
with pl.Config() as cfg:
    cfg.set_tbl_rows(5)
    cfg.set_fmt_str_lengths(10)
    
    # DataFrame display uses temporary settings
    print(df.head(10))

# Settings restored after context
print(df.head(10))  # Uses default settings

# Custom optimization flags
opt_flags = pl.QueryOptFlags(
    predicate_pushdown=True,
    projection_pushdown=True,
    streaming=True
)

# Use with LazyFrame collection
result = (
    pl.scan_csv("large_file.csv")
    .filter(pl.col("amount") > 1000)
    .select(["id", "amount", "date"])
    .collect(**opt_flags.__dict__)
)

# Save current configuration
pl.Config.save("my_polars_config.json")

# Modify settings
pl.Config.set_tbl_rows(50)
pl.Config.set_streaming_chunk_size(1000000)

# Later, restore saved configuration
pl.Config.load("my_polars_config.json")

# Or restore defaults
pl.Config.restore_defaults()