Documentation

Decode the values from a dictionary page.

The numVals argument is the entry count declared in the dictionary page header. It is used to limit BOOLEAN decoding (1-bit-per-value encoding has no natural delimiter).

The typeLength argument is only meaningful for FIXED_LEN_BYTE_ARRAY: it is the byte-width of each individual dictionary entry, NOT the total number of entries. Passing numVals here (the old behaviour) would cause it to be misread as an element size, yielding a dictionary that is far too small.