[Bug] Variable substitution error

[duhanmin]

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• I searched the issues and found no similar issues.

Linkis Component

linkis-commons

What happened + What you expected to happen

Variable substitution error

dss_autotest.demo_data{ds=20220516}

Incorrect results

dss_autotest.demo_data228=20220516

Relevent platform

Reproduction script

Anything else

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

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