DRILL-7041: CompileException happens if a nested coalesce function returns null #1668
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…turns null - Made `NullExpression`s in `IfExpression` with nested `IfExpression`s to be rewritten to typed ones recursively if necessary
lushuifeng
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Jun 21, 2019
…turns null - Made `NullExpression`s in `IfExpression` with nested `IfExpression`s to be rewritten to typed ones recursively if necessary closes apache#1668
xiangt920
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Dec 26, 2019
…turns null - Made `NullExpression`s in `IfExpression` with nested `IfExpression`s to be rewritten to typed ones recursively if necessary closes apache#1668
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NullExpressions inIfExpressionwith nestedIfExpressions to be rewritten to typed ones recursively if necessary