[SPARK-48530][SQL] Support for local variables in SQL Scripting#49445

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dusantism-db wants to merge 63 commits intoapache:masterfrom

dusantism-db:scripting-local-variables

Commits on Dec 24, 2024

Commits on Dec 25, 2024

Commits on Dec 27, 2024

implement proper namespace (scope label name) for local variables
dusantism-db
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Commits on Dec 30, 2024

qualified names
dusantism-db
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Commits on Jan 3, 2025

Commits on Jan 6, 2025

resolve fully qualified session vars in tempvarManager only and update ResolveCatalogs to support local vars, also to throw error when creating qualified local vars
dusantism-db
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tests first batch
dusantism-db
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Commits on Jan 13, 2025

Commits on Jan 15, 2025

fix comments
dusantism-db
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Commits on Jan 16, 2025

Update CreateVar, SetVar and lookupVariable to work with Execute Immediate, including the USING and INTO clauses.
dusantism-db
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Commits on Jan 21, 2025

Commits on Jan 22, 2025

refactor SqlScriptingVariableManager to be LexicalThreadLocal singleton, rather than a field in CatalogManager
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Commits on Jan 23, 2025

renames
dusantism-db
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Commits on Jan 24, 2025

Commits on Jan 25, 2025

remove into clause flag
dusantism-db
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Commits on Jan 27, 2025

Commits on Feb 6, 2025

Commits on Feb 10, 2025

resolve comments again
dusantism-db
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Commits on Feb 20, 2025

add more checks to setvariableexec
dusantism-db
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