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fix: #2883 pickle data was truncated error in database session using MySql

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Merge https://github.com/google/adk-python/pull/2884

closes: #2883
# Fix
When put leage data into event and load it. the _pickle.UnpicklingError was occurred.
The root caurse is `DynamicPickleType` mapping `BLOB` as default in case of MySql, not `LONGBLOB`. And learge data will be able to cut off tail of data. And raise pickle error.

# What todo
Defined `LONFBLOB` as default explicitly.

# Question
Where should we code the test code like this case? I cannot found the test code the DB and table was created expectedly.

COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/2884 from Lin-Nikaido:fix/#2883-mysql-datatype-fix 2be9b38fc3f5d5083b0b6715a2bf7b4eff5d947b
PiperOrigin-RevId: 819891727
This commit is contained in:
Lin Nikaido
2025-10-15 13:33:22 -07:00
committed by Copybara-Service
parent a985cc38ec
commit 36c96ec5b3
1 changed files with 2 additions and 0 deletions
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src/google/adk/sessions/database_session_service.py
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@@ -112,6 +112,8 @@ class DynamicPickleType(TypeDecorator):
impl = PickleType
def load_dialect_impl(self, dialect):
if dialect.name == "mysql":
return dialect.type_descriptor(mysql.LONGBLOB)
if dialect.name == "spanner+spanner":
from google.cloud.sqlalchemy_spanner.sqlalchemy_spanner import SpannerPickleType