fix: correct default value backfill during AddField

[czs007]

issue: #44585
pr: #45634

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[sre-ci-robot]

[INFO] PR Label Summary by Default
[FAILED] PR #45634 not merged

• Title: fix: correct default value backfill during AddField
• Status: OPEN
• Link: fix: correct default value backfill during AddField #45634

[WARNING] Milestone not set

• PR: fix: correct default value backfill during AddField #45644
• Title: fix: correct default value backfill during AddField
  Please set a milestone for better release tracking

You can set milestone by commenting:
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Example:
/set-milestone 2.5.0

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[codecov]

Codecov Report

❌ Patch coverage is 11.73913% with 203 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.62%. Comparing base (cb08db0) to head (356ec8c).
⚠️ Report is 251 commits behind head on 2.6.

Files with missing lines	Patch %	Lines
pkg/util/timestamptz/timestamptz.go	13.08%	164 Missing and 2 partials ⚠️
...tcoord/ddl_callbacks_alter_collection_add_field.go	0.00%	5 Missing and 1 partial ⚠️
internal/proxy/http_req_impl.go	0.00%	4 Missing and 1 partial ⚠️
internal/proxy/service_provider.go	20.00%	3 Missing and 1 partial ⚠️
internal/proxy/validate_util.go	0.00%	3 Missing ⚠️
internal/parser/planparserv2/parser_visitor.go	0.00%	2 Missing ⚠️
internal/proxy/task.go	0.00%	0 Missing and 2 partials ⚠️
internal/proxy/task_database.go	0.00%	0 Missing and 2 partials ⚠️
internal/rootcoord/create_collection_task.go	0.00%	0 Missing and 2 partials ⚠️
internal/util/importutilv2/parquet/field_reader.go	0.00%	2 Missing ⚠️
... and 9 more

Additional details and impacted files

@@            Coverage Diff             @@
##              2.6   #45644      +/-   ##
==========================================
- Coverage   76.99%   76.62%   -0.38%     
==========================================
  Files        1700     1856     +156     
  Lines      262533   287687   +25154     
==========================================
+ Hits       202142   220438   +18296     
- Misses      53550    59911    +6361     
- Partials     6841     7338     +497     

Components	Coverage Δ
Client	78.03% <65.76%> (-0.11%)	⬇️
Core	83.66% <79.17%> (+1.44%)	⬆️
Go	74.64% <52.39%> (-0.75%)	⬇️

Files with missing lines	Coverage Δ
internal/proxy/impl.go	72.97% <ø> (-0.93%)	⬇️
...ernal/rootcoord/ddl_callbacks_create_collection.go	85.81% <100.00%> (ø)
internal/rootcoord/describe_collection_task.go	91.89% <ø> (ø)
internal/rootcoord/root_coord.go	78.81% <ø> (-4.97%)	⬇️
internal/proxy/task_query.go	74.76% <0.00%> (+2.44%)	⬆️
internal/proxy/task_search.go	69.05% <0.00%> (-1.94%)	⬇️
internal/proxy/util.go	77.86% <0.00%> (-4.64%)	⬇️
...coord/ddl_callbacks_alter_collection_properties.go	78.20% <0.00%> (ø)
internal/rootcoord/ddl_callbacks_alter_database.go	71.77% <0.00%> (ø)
...nternal/rootcoord/ddl_callbacks_create_database.go	61.70% <0.00%> (ø)
... and 13 more

... and 614 files with indirect coverage changes

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[xiaocai2333]

/lgtm

[sre-ci-robot]

[INFO] PR Label Summary by Default
[SUCCESS] PR #45634 merged to master

• Title: fix: correct default value backfill during AddField
• Link: fix: correct default value backfill during AddField #45634

Use /refresh-label to update related check and label manually