lightning: fix parquet parser for decimal type (#1272) (#1277)

[glorv]

This is an automated cherry-pick of #1277

What problem does this PR solve?

Fix parse parquet file when the corresponding type is decimal with FIXED_LEN_BYTE_ARRAY or BINARY

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

Side effects

Related changes

Release note

• Fix parquet parse when parse decimal type

[ti-chi-bot]

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[ti-chi-bot]

@glorv: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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[glorv]

/run-all-tests tidb=release-5.0 tikv=release-5.0 pd=release-5.0 importer=release-5.0 cdc=release-5.0

[glorv]

/run-all-tests tidb=release-5.0 tikv=release-5.0 pd=release-5.0 importer=release-5.0 cdc=release-5.0

[glorv]

/run-all-tests tidb=release-5.0 tikv=release-5.0 pd=release-5.0 importer=release-5.0

[glorv]

/run-all-tests tidb=release-5.0 tikv=release-5.0 pd=release-5.0 importer=release-5.0