[SQL][DOC] Fix documentation of lpad
## What changes were proposed in this pull request? Fix incomplete documentation for `lpad`. Author: actuaryzhang <actuaryzhang10@gmail.com> Closes #18367 from actuaryzhang/SQLDoc.
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@ -2292,7 +2292,8 @@ object functions {
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}
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}
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/**
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/**
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* Left-pad the string column with
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* Left-pad the string column with pad to a length of len. If the string column is longer
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* than len, the return value is shortened to len characters.
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*
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*
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* @group string_funcs
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* @group string_funcs
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* @since 1.5.0
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* @since 1.5.0
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@ -2350,7 +2351,8 @@ object functions {
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def unbase64(e: Column): Column = withExpr { UnBase64(e.expr) }
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def unbase64(e: Column): Column = withExpr { UnBase64(e.expr) }
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/**
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/**
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* Right-padded with pad to a length of len.
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* Right-pad the string column with pad to a length of len. If the string column is longer
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* than len, the return value is shortened to len characters.
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*
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*
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* @group string_funcs
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* @group string_funcs
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* @since 1.5.0
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* @since 1.5.0
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