fix: dialect.has_table() fixed

[jerrinot]

Tt was missing the last **kw argument. For this reason Pandas/Polars could not use QuestDB as a target.

This now works:

import polars as pl
from datetime import datetime, timezone

data = {
    "event_time": [
        datetime(2024, 1, 1, 10, 0, 0, microsecond=1, tzinfo=timezone.utc),
        datetime(2024, 1, 1, 10, 0, 5, tzinfo=timezone.utc),
        datetime(2024, 1, 1, 10, 0, 10, tzinfo=timezone.utc),
        datetime(2024, 1, 1, 10, 0, 15, tzinfo=timezone.utc),
    ],
    "sensor_id": ["sensor_alpha", "sensor_beta", "sensor_alpha", "sensor_gamma"],
    "temperature": [22.5, 23.1, 22.7, 25.0],
    "humidity": [45.0, 47.5, 45.5, 42.1],
    "status": ["normal", "normal", "warning", "normal"],
}
df = pl.DataFrame(data)
df = df.with_columns(pl.col("event_time").cast(pl.Datetime(time_unit="us")))

QUESTDB_PG_URI = "questdb://admin:quest@localhost:8812/qdb"
TABLE_NAME = "sensor_readings_polars"

print("Polars DataFrame to be written:")
print(df)

df.write_database(
    table_name=TABLE_NAME,
    connection=QUESTDB_PG_URI,
    if_table_exists="append",
    engine="sqlalchemy"
)
print(f"\nSuccessfully wrote DataFrame to QuestDB table: '{TABLE_NAME}'")

Writting frames via psycopg2 is far from ideal from a performance point of view, but it's better than failing with:

Traceback (most recent call last):
  File "/home/jara/devel/tmp/polars_test/test.py", line 25, in <module>
    df.write_database(
  File "/home/jara/devel/tmp/polars_test/.venv/lib/python3.11/site-packages/polars/dataframe/frame.py", line 4278, in write_database
    res: int | None = self.to_pandas(
                      ^^^^^^^^^^^^^^^
  File "/home/jara/devel/tmp/polars_test/.venv/lib/python3.11/site-packages/pandas/util/_decorators.py", line 333, in wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/home/jara/devel/tmp/polars_test/.venv/lib/python3.11/site-packages/pandas/core/generic.py", line 3087, in to_sql
    return sql.to_sql(
           ^^^^^^^^^^^
  File "/home/jara/devel/tmp/polars_test/.venv/lib/python3.11/site-packages/pandas/io/sql.py", line 842, in to_sql
    return pandas_sql.to_sql(
           ^^^^^^^^^^^^^^^^^^
  File "/home/jara/devel/tmp/polars_test/.venv/lib/python3.11/site-packages/pandas/io/sql.py", line 2008, in to_sql
    table = self.prep_table(
            ^^^^^^^^^^^^^^^^
  File "/home/jara/devel/tmp/polars_test/.venv/lib/python3.11/site-packages/pandas/io/sql.py", line 1912, in prep_table
    table.create()
  File "/home/jara/devel/tmp/polars_test/.venv/lib/python3.11/site-packages/pandas/io/sql.py", line 984, in create
    if self.exists():
       ^^^^^^^^^^^^^
  File "/home/jara/devel/tmp/polars_test/.venv/lib/python3.11/site-packages/pandas/io/sql.py", line 970, in exists
    return self.pd_sql.has_table(self.name, self.schema)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jara/devel/tmp/polars_test/.venv/lib/python3.11/site-packages/pandas/io/sql.py", line 2041, in has_table
    return insp.has_table(name, schema or self.meta.schema)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jara/devel/tmp/polars_test/.venv/lib/python3.11/site-packages/sqlalchemy/engine/reflection.py", line 439, in has_table
    return self.dialect.has_table(
           ^^^^^^^^^^^^^^^^^^^^^^^
TypeError: QuestDBDialect.has_table() got an unexpected keyword argument 'info_cache'