Fix large string val allocation failure#3724

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EmmyMiao87 merged 3 commits intoapache:masterfrom

EmmyMiao87:fix_big_bitmap

Jun 3, 2020

Commits on May 29, 2020

Fix large string val allocation failure
EmmyMiao87
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Commits on Jun 1, 2020

Change comment
EmmyMiao87
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Commits on Jun 2, 2020

Add check
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